Help! Loping idle on 4.0 FI

[mudhoney]

My 1995 Jeep Grand Cherokee Laredo has a loping idle and on the road it is getting worse. I tested fuel pressure on fuel rail, it is at 41 lbs while idling. I checked the codes by turning key off and on several times, it came up with a 55, which is ok. I do have an exhaust leak but not sure if it is related. Every time it lopes i hear a slight tick coming from what apears to be the PCM, on the passenger firewall. Any help or direction is appreciated. Im not to familiar with the Jeep. (i am a toyota guy)

 

[Bunk1]

Vacuum leak could create that problem.

 

[Cascade_Crawler]

if you still are stumped later you can check out...

http://www.nagca.com/forum/

 

[wazz]

a cylinder ballance check would be a good idea like pulling 1 plug wire at a time, maybe a vaccume reading have you checked that kind of stuff?

 

[mudhoney]

I'm to impatient and frustrated took it to the dealer last night. Huge crack in manifold. They are going to give it a good tune up and test again on a cold start. They tested all cylinders 2 @ 145 all others in the 150's all the sensors checked out ok no leaks and No codes came up with the diagnostics. Looks like i will be putting on the manifold.