Okay, I will try to keep my posts short to make this managable for everyone. Recently rebuilt a 5.7 HEMI 345ci and it will not idle. Symptoms seem like a bad valve spring (Common Issue) but all of them look good (No cracks or wear) *Driver side head is new as well as piston #1 and rings. Codes so far are p0300 (Misfire) and p0113 (IAT sensor. This code only popped up after i diconnected the sensor to see if it would make a difference. Any help is greatly appreciated. Thanks for reading.

 

Wrong vehicle, wrong year, wrong forum.

 

i'll give you my best guess. you forgot to plug something back in. fuel injection is very forgiving in stock form. unless you damage the harness or forget to plug something in. double check your connections. specifically the idle air control, plug wires and any harness leading to the coils.

and yeah, this is the 2nd gen section.

 

also if your scanner supports it, your vehicle should be able to tell you what cylinder is misfiring.

 

Moved to the correct section.