Sorry, did not know that you already moved the coil pack and cleaned the connector with CRC. Are you still using a cheap no AC Delco coolant sensor?

 

It is an ac Delco coolant sensor

 

If I can upload a video here (I’m unsure) I can start the hummer and show a video of engine running. Seems to have a “slight” miss at idle but check engine light isnt flashing at idle.. only when it seems to be “under a load”

 

I’m going to check the catalytic converter’s. But could this only make one cylinder misfire? It only starts flashing when I go from park to drive (or reverse) and give it a little gas.

 

Did you check fuel pressure?

 

I put a new one in around 3 years or so ago. What should that read? I will check that next

 

57psi

 

I checked the front weld ring and rear weld ring with a IR temp gun. The front read 325 (max was 352) and the rear is at 511.. could this be the issue?

 

A properly functioning catalytic converter will typically have a rear weld ring temperature that is around 150 degrees Fahrenheit higher than the front.

 

I switched coil 5 and 4 around again (boredom) and still a misfire on cylinder 5 and also got code p0106.. was looking to replace the map sensor but there isn’t a ac delco one?? Any suggestions?