I love my Cherokees. But one is being a problem child. I have done lots of work on it and spent lots of money, but it still runs like crap. I will start and run, but it stumbles and will not idle smooth. If left to run it will eventually shut off. Here is a list of the things I have done to it.

Rebuilt motor
New bearings
New rings
New cap, plugs, and wires
Checked wiring
New Crank position sensor
New flex plate
Cleaned, machined, and reset valves on head
New bored throttle body and sensors (Thanks Dennis)
Cleaned intake manifold
Cleaned injectors and made sure they worked
New Timing chain and gears
Set timing
New Map sensor
New computer
New Fuel filter
Repeatedly checked for vacume leaks

If anyone knows another way to look please let me know. As I said, I love my cherokee, but I am at my witts ends on this one. Please Help

 

Did you do anything with you iac?

 

If that is one of the sensors on the throttle body then yes. If not, then please explain what and where it is.

thank you

 

It's on the tb..... But it's fragile though. Too hard of a cleaning or being rough with removal could bend the plunger rendering it usless.

 

What year is your XJ btw?

 

did you check the fuel pump ?

 

It is a 93. The fuel pump is next.

 

How did you "set the timing"?

 

Your timing or firing order is wrong.