My 91 YJ seems to be giving me some trouble. It is a 4.0L, auto.
Occasionally on starting (I would say 40% of the time) the Jeep will start, but then die right away. If I immediatly try to restart it, it will just crank and crank with no fire. If I return the key to the off position, then turn to the on position, wait a few seconds, then attempt to restart, it will ususally start right up. I have tried pressing the gas pedal a little upon starting once I hear the firing, but it is to no avail and makes no difference. This problem may or not be related to the next one:
While driving sometimes, the vehicle will feel like it has completly lost power. The vehicle does not stall or backfire, it just feels like the car won't "go". It will happen during any driving conditions (acceleration, cruising, and slowing down) and only lasts one or two seconds. Other than those issues, it runs perfectly.
I have recently replaced the catalytic convertor, muffler, fuel filter, spark plugs, wire, distributor cap, rotor, oil. I made sure that both the cat and the fuel filter are flowing in the correct direction, and the fuel pump does turn on when the key is put in the on position (I hear the click and a quick hum). These symptoms existed before I changed the above parts too. Also, I've ran SeaFoam through the TB and the fuel tank less than 400 miles ago.
Anyone have any ideas?? I have to drive this rig through a pretty bad part of town to get to work every day and I REALLY don't want to get stranded. Any help would be greatly appreciated!