Jeep Bucks on after start-up

[butch1021]

First i want to say hi, and that I love my jeep. It is a 98 grand cherokee laredo, with 62,000k. Here is my problem, when I start my truck in the morning I get a very rough idle, then if I give it gas in gear it will buck and pop, then go, then buck again. Then it will go away in about 2 minutes, and will not do it again unless the truck sits a while. I have new plugs and wires, new distrubuter, and cap. I then brought to jeep and 1200.00 dollars later they replaced both o2 sensors, cleaned and replaced thottle body seal, then new fuel pump, and new fuel pressure regulator. I need help!!!!!!!!!!!!

[jmbrowning]

Tarrytown, is that someplace where you might have condensation and subsequently water in your gas tank? Try HEET methanol to turn the water into something mildly more flammable?

[butch1021]

Tarrytown is in New York, and I have tried both dry gas, and fuel injector cleaner.

[rick]

Which engine?

[butch1021]

inline 6

[rick]

Could be the crank position sensor? Have you tried that yet? How about timing?

[Dukes69]

I had a problem on my 88 Xj similar to that. The CPS had a bad connection and it was sending a bad siginal to the computer. I unplugged and pluged back in the connector a couple times and it fixed it. I dont know if thats the same as your problem, but it might help. I'd also check the TPS

[butch1021]

the truck is back at the dealer. I told them I will not pay anything more, and dont want it back untill it is fixed. I asked about the CPS, and the tech told me it would throw a code, and my jeep is not.