1994 Jeep YJ

Engine Performance problem
1994 Jeep YJ 6 cyl Four Wheel Drive Manual 157000 miles

I had my distributor stolen from my jeep, before I realized that it was gone I cranked it over two or three times. I purchased a new distributor, plug wires, plugs and coil. Set the timing according to the repair manual. The jeep does not run like it use to with the new parts installed, it also consumes an extra amount of gas. At Idle when you push down on the accelator and let off it backfires. It also stutters when accelerating at Idle.
There may be multiple problems but the symptoms are:
In 1st, 2nd, 3rd and 4th gear it has some power but in fifth no matter how much pedal you give it it loses mph. I also noticed that before the above problem the passenger side floor board under the seat is extremely hot. We just replaced the exhaust and intake gasket and also the radiator, hoses and temp gauage. The radiator was leaking and the temp was going above 195 and over 210 while driving in fourth gear. The jeep ran fine before this happened even with the bad spark plugs which I knew needed replaced. Any suggestions?
August 31, 2010.

Im not 100% positive, but I know on some older jeeps the distributor has a vacuum advance that has to be disconnected when setting timing, and once thats disconnected, it wants to stall so you have to maintain 2500 rpms while setting base timing. Then when you plug in the vacuum advance, at idle the timing should be I want to say 15 degrees advanced. There are alot of great techs on here that should beable to verify the facts.

Aug 31, 2010.
As far as it running hot now, sounds like it may be advanced to far.

Aug 31, 2010.