I have a 94 4dr Kick with the 16v in it and have been having some drivability issues with it. Under load at lower rpm's(3500 and under) it feels like I am running out of fuel as if the filter was plugging off. I have replaced the filter and no change, I removed the injectors and had them tested and new screens put in. After this it ran a little better for a few days then back to the problem. I have changed the plugs, cap, rotor, wires and ran intake cleaner down it's throat. I have also run lots of injector cleaner through it. I pulled the gas tank and removed the sender and pump and dumped all the gas out to inspect the tank, everything looks decent. Also when the motor is cold it acts like an old car that has a bad accelerator pump in the carb. If I let it warm up it doesn't do this very much at all but cold it is terrible. I'm thinking that these problems are somehow related but I can't seem to find the common denominator.  This is my daily driver so I need it to be reliable and this problem is driving me nuts.
If anyone can shed some light on this I would be ever so grateful.
Thanks in advance

Checked your fuel pressure

did you wash the engine with it running

Checked your fuel pressure

 
I haven't checked the pressure but I did notice that it had a newer pump in the tank with an 03 date on it. Last night when I came home I just started it and tried to drive and had to rev it up a fair bit to get it moving, then when I shifted gears it would fall flat on it's face. Once warm it was better?

did you wash the engine with it running

I haven't washed it

went mudding a while back in the geo and went to cleanoff at the car wash ,a miss started, then got worse ,i changed every thing from fuel pump to fuel filter to all plugs and wires to rotor all of it ,retimed it ,new timing belt,ground straps, cut the whole exuast off from the manifold back ,new exuast with out cat,then gave up ,6 months later friends pathfinder did the same thing, found out my plug wires were cheap as hell ,spent $15 more on plug wires .fixed it, crazyest thing i ever seen now runs like a champ

I am going tomorrow to see if my Tracker is truly fixed after spending $355 at the first shop I took it to.  They told me that the egr was bad and that htey had it running pretty good, with just a small miss left probably from a bad distributor (the only way to buy a new pick up).

My symptoms are that it runs well cold, then dies after warming up.  No power under 3000 rpm.  we will see tomorrow if it is fixed.

Mojoinco

I forgot to mention that the original problem seemed related to a stuck thermostat.  May have been a red herring.  I also had replaced the wear items in the ignition with all NAPA parts (I bought the mid grade plug wires.  The second shop replaced them and tells me that it is fixed.  Tomorrow will tell....

also have a 94 sidekick 4dr 16 V.  vehicle sat for some time.  Had and sometimes still has 1) intermitent low power 2) miss at low and higher speeds  3) engine check light comes on and then goes out when vehicle runs better  4) idle low and high   Had rust inside gas tank and fuel filter.  Replaced both.  Had tune up and injectors cleaned.  Vehicle ran better.  Got some bad fuel at recent fillup.  Gas additives for water and injectors.  Vehicle running better.  Still acts up intermitently.  Shop thinks computer may be bad?  Am driving daily.  Is lifted now.  I like it a lot.  Was Willys guy for many years.  Have CJ3B for sale.

Update
I have removed the cat and fitted a "test pipe"  this has helped some with the power output but the miss and the falling on its face continues. This problem seems to be directly related to temp of motor so therefore leads me to believe that it is a sensor. But which one??? Does anyone have a Sidekick FSM that I could get a copy of the section dealing with testing the sensors. Hayes and Chilton don't seem to have what I need.

try getting the ECM rebuilt, it sounds so much like that problem. zuwharrie.com has a lot of info about bad ECM's (getting mine rebuilt now for many of the same problems,we'll see. Shop said it needed a new engine, but there was no clanging or banging or scraping sounds)

Oh, from a 95 4door with auto and 4wd.

Just spent $355 for work.  Spent ~$300 changing parts.  Spent $175 more for work.  $175 got me a new set of spark plug wires.  I had replaced the wires in November.  Bought the Federal-Mogul mid priced wires from NAPA in November.  Took them and the distrbiutor (in addtion to the other parts) back to NAPA.  To their credit they took them back (could have stuck me with the distro and replaced the wires).  Now I have a new O2 sensor, temp sensor, torqued head gasket, $179 egr (from the $355 work).  Also checked valves, timing belt, removed replaced intake and components, torqued head, replaced a couple lines. 

And an honest and quick shop, should I ever need one again.  Problem was that it was masked by a red herring other problem that had me looking for issues related to it.  The problem surfaced weeks after replacement with the other issue.  The new wires even passed the ohm test (well within range).  Will not forget this one soon.

So what your saying is that your problem stemmed from a poor quality set of plug wires? If so what wires did you replace them with?

Paid $175 for a set of 'gray' wires (installed  ::)of course).  Don't know the brand.  May have been Carrol's, which is the Federal Mogul's that NAPA was selling as the mid line.  Apparently the cold did them in.  Carrol makes them for other brands as well (Fram for example).  Usually not too many actual vendors for any particular component out there.  Just depends on what the private label wants to spec them as.

Worth a try for the money.  Or borrow a set from a bud (hell, just junkyard a set of OEM's, as mine are still good at 150000 and 8 years).

I ordered up a set of Aurora wires today as the oem wires are $137.    Aurora has a pretty good name in high perf wires so I figure they should be good