I have a 1996 Tracker I bought for 200.00 bucks, and drove it home. It was running like crap so i did the usual. New Plugs, Wires, Cap, Button, Alternator, battery, oil change, run a couple bottles of fuelinjector cleaner through it. The check engine light is on but I dont have a scan tool. The cat is hollow and the rear 02 sensor is not there they pluged the hole. After I start it in the morning it runs good while it sits there. Let it run for 15 min because it is could up her (maine) While I am driveing it skips and bucks when I stop at the first stops sign it dies. Start it back up and it bounces on the rpm's between 200-800. It will do that for a while then it will creap up to 800 and run fine untill i shut it off and start it again. I dont know how much milliage I shoul be getting but I get 140 To a tank so it seams afuly low. I found the egr laying on the motor there was no bolts in it. I took it out and cleaned it up with carb cleaner put it back on it still ran bad. I also tried to clean the sensor on the intake that I kept reading about but still nothing. any help woul be greatful. Ohh by the way it has 120000 on the motor and it dosent tick or make a sound. Off topic a little is there a way to calibrate the speedo for the 31 i put on it?