OK I have a 1998 Grand Cherokee that has about 116,000 miles on it with the 4.0L. It is a 4x4 Larado Package. I recently had the muffler replace and after that i would drive it for about 5 miles and it would act like someone was turning the fuel on and off. I would lose all power and have to pull over and wait for it to go away. It would last about 15 minutes and you could smell a load of fuel until it went away. It would then run normal again until you drive if a couple of miles.
Now i took it back to the shop and they said i need a new converter. I took it back home and cut the converter out and put a straight pipe in. Still does the same thing. I checked the fuel pressure and it runs at about 47lbs so that should be good.
I am not sure what i am missing but i hear alot of people talking about either the TPS or AIC.....could either of these cause this problem? I am going to test the TPS (after reading the posts .25 - .50 volts i think). Any other ideas? It does only happen when warm and there are no exhaust leaks.
Thanks in advance.