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Have you guys checked the coolant temp sensor reading on a scanner when up to operation temp?
if the phasers are done and the timing is correct, it sould not be the problem. Wont hurt to check the cam timing on the computer too.
The truck has been to two different dealers for about 10 days a piece, they said they ran every diagnostic check possible and nothing was found. No misfires, timing was good, plenty of fuel, fuel/air mixture was accurate, etc, etc. Got into the Mode 6, I was there for that, and could not see anything out of the ordinary...
but I have not check the coolant temp sensor, not to say someone has or has not, but when I get home I'll change it anyways, they're cheap and easy...might as well add anther part to the list