03 Ram 5.7 Hemi problems.

I'm not sure if this is the right place for this question, but here goes. I just replaced the head gaskets on my 03 5.7 hemi in a quad cab truck. Everything seemed to go very well until my first time going any distance with it. When warmed up to operating temp, it seems to have a misfire at around 1500 rpm and the Idle drops to about 500 rpm as well.

I went back through and checked all my wiring connections and everything is good. It shows no codes. When I first started it up in the shop it had P0113 - Intake air tempsensor circuit, voltage too high (It wasn't connected when I first fired it so that is why), and P0117 - Engine coolant temp sensor circuit, voltage too low. I cleared them and they never came back.

It always starts good, runs good at 2000 plus RPM but at warm idle and 1500 rpm cruise it seems to run rough and misfire.

I'm not too familiar with the newer stuff, so any guidance would be greatly appreciated.

Admins please move to a more appropriate board if necessary.

Cley