I have absolutely no experience with this, but I'm going to take a guess and say your O2 sensor is starting to go bad, maybe? Back when we had the TJ, an oxygen sensor went bad and caused rough idle and no acceleration at random.

I could, of course, be completely wrong. So don't take my word for it.

 

O2 sensors are brand new. Thanks

 

Cleaning the throttle body could be it. I know when under the butterfly flap (as I call it) it can get gross. So some carburetor cleaner can be used. Just pull the line to flip the flap so you can see in there to determine if it's dirty. This worked for me.

 

I've cleaned the TB.

Also, new plugs, cleaned IAC, new MAP, new intake air temp sensor, and new TPS.

 

TPS been tested? Sensor ground is good? Plug wires, distributor cap and rotor?

 

How do you test TPS?

Not sure about the ground. Do you mean the ground wire in the pigtail?

 

Go to the writeups section and check Cruiser54's Mostly Renix Tips.

Exact values you should be testing for will depend on year. Chrysler models should use info that's regularly posted by tjwalker

 

Thanks

 

This might help. I'm not a renix.

2000 4.0 auto

 

Sounds like the very common problem of the discharge of fuel pressure at the fuel rail. Next time it does it turn the key off and then back on, activating the fuel pump, let the fuel pressure recharge and try starting again.

 

I am rebuilding my jeep an need new exhaust. Previous owner welded a cherry bomb an it snapped so need totally new exhuast. Any ideas

 

I'm very happy with my Flowmaster Super 40. 2.5" piping.

 

Can you post a video of how it sounds please. I'm about to put a new exhaust complete system in mine and I'm back and forth between the 44 and 40 with the 2.5" pipe.

 

I have a super 44 on my xj and I like it. I can't say anything about how it sound cause I'm deaf. Lol.

 

Haha