4.0 sporatic idle.

[4.3LXJ]

Then I would suggest pulling the battery cables and touching them together for a few seconds to reset the computer. Be patient, these ECMs are slow learners

[Dwskevin]

Great, I will give that a try.
Thanks

[gregs94]

can always spray the throttle body with cleaner to get rid of any build up, and clean the throttle blade real good, any carbon around the blade will cause it to idle funky if its not metering the air correctly, always worked on my XJ to improve idle..

[Dwskevin]

Ok. I cleared the computer so I will
Drive it this weekend and see what happens. I will also clean the throttle body.
Thanks.

[gregs94]

any results?

[Dwskevin]

It wouldn't start? I left it at work parking all weekend. I'm leaving town for a week so I'll have to get to it when I can. Thanks for checking in I appreciate it

[Dwskevin]

Update. Still having problems with the rebuilt 4.0. We got it to idol and run by modifying the distributor mounting bracket. We ground out one side of the bracket so the distributor could rotate a little more which solves the problem. No idea why that worked? What is wrong inside the motor? Yes the timing chain and gear have been replaced again.
Now smog CERT Is due and it's running with extremely high Nox. All sensors and cat have been replaced. What the heck is wrong with this motor?
I just want to get on the trail.
Even though it's not running right I still went head and finished the install of the front Clayton 3 link.
Thanks
Kevin