I have recently done some general maintenance on my Samurai. I replaced spark plugs, spark plug wires, distributor cap, old vacuum hoses, air filter, catalytic converter, and cleaned carburetor. The car ran perfectly fine after replacing everything except for the catalytic converter. The car now has trouble starting and has trouble running at low rpm. It idles fine until it is put into gear and sputters when stopping at stop signs etc...  The car also makes a really hard clunk when i give it throttle from an idle. The problem seems like a fuel problem but i don't know exactly what it is. PLEASE HELP.