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1- so coil , injectors plugs brand new correct ?
2- have you replaced the intake manifold gasket when heads was rebuild ?
3- have you checked for vacuum leaks
4- fuel pressure checked : are you seeing 49.2 +/- 5 PSI
5- If the PCM getting hot and at that time intermittently kill injector #1 , that could be the issue ( A rebuild one will be way to go if that is the issue )
allcomputerresources.com will be good site , it will be plug & play no programming needed
is this the original PCM of the Jeep ?
Please let me know
ASE Certified Technician
This the The wiring circuit diagram
a cam sensors also will cause this ,also connected to PCM
yes on all the above
wish i had a specific answer , let me ask you this , does it reset when you cycle the switch
has the problem been consistent always does it after all replaced or somethings made it better as far as it takes longer to throw the check engine light
after a certain repair you did , or that work done at once
so all that time and parts replacement that misfire problem stayed after highway use ?
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I have seen this on a 4.0L jeep before. It is defiantly a valve train problem. Since the head has been worked I would have to question the hyd lifters. Are they original?
You may have a lifter on #1 pumping up at higher RPM and speeds and when you stop it is holding the valve open to long and opening to far.
I do have a suggestion but it is not exactly a text book repair.
There is a service bulletin about the valve springs. I have replaced valve springs to fix similar problems on the 4.0L. But the head has been worked so the should have check valve spring pressure.
No never heard of loss of communication.
No not a timing chain.