jjmat3
NAXJA Forum User
- Location
- Big Bear & Lancaster
I have a strange problem and need guidance on where to start. My 94 XJ, 4.0L/Auto all stock engine, was running like a top while DD-ing it for about 6 months (usually only weekend play dates prior to that but ran fine) until the day I went to PU another Jeep and then it started acting like it had a plugged cat. I went ahead and parked it figuring I would get around to changing it eventually and now 6 months later I did.......
Symptoms when I parked it were that it had a high speed miss/stumble kind of feel to it but would also feel like it was missing under aceleration from an idle. This all came on suddenly with no problems leading up to it.
Anyhow, i let it sit the last several months since I didn't need to drive it. Recently I finally took care of other issues like replacing a badly dented gas tank (replaced last weekend) added a tank skid, tune-up w/ plugs, fuel filter, oil change in preperation for a smog check I am overdue for.
Ran it around town this morning for several miles of stop and go traffic, short little high speed blast down a stretch of road, stopped for gas, put a few gallons in, ran it to the muffler shop and it ran great during that whole trip, about 10 miles and 20 minutes worth.
Picked it up from the muffler shop where they installed a new cat and tail pipe. Ran fine for the first few miles, about 15 mins worth in stop & go traffic, sitting at lights, etc and then all of a sudden it started acting weird again, stumbling under acceleration and slightly at idle in gear but seemed smoother in neutral...... UGH!
What would you XJ pros check? I will be looking at easy stuff like the cap and rotor tomorrow but figure that wouldn't cause intermittent problems.
Help!?
Symptoms when I parked it were that it had a high speed miss/stumble kind of feel to it but would also feel like it was missing under aceleration from an idle. This all came on suddenly with no problems leading up to it.
Anyhow, i let it sit the last several months since I didn't need to drive it. Recently I finally took care of other issues like replacing a badly dented gas tank (replaced last weekend) added a tank skid, tune-up w/ plugs, fuel filter, oil change in preperation for a smog check I am overdue for.
Ran it around town this morning for several miles of stop and go traffic, short little high speed blast down a stretch of road, stopped for gas, put a few gallons in, ran it to the muffler shop and it ran great during that whole trip, about 10 miles and 20 minutes worth.
Picked it up from the muffler shop where they installed a new cat and tail pipe. Ran fine for the first few miles, about 15 mins worth in stop & go traffic, sitting at lights, etc and then all of a sudden it started acting weird again, stumbling under acceleration and slightly at idle in gear but seemed smoother in neutral...... UGH!
What would you XJ pros check? I will be looking at easy stuff like the cap and rotor tomorrow but figure that wouldn't cause intermittent problems.
Help!?