The IAC is considered a non-servicable part. Sometimes cleaning it resolves it temporarily and in very rare cases, permanently. You're better off...
I recently replaced my A/C system minus the condensor and used Four Seasons compressor, office tube and accumulator with no problems. It was...
Have you put the plugs in yet? My Pontiac did that same thing when one of the plugs were bad. It was horrible sounding once she warmed up. Made the...
Removing the fuel rail makes it easier but you do not need to.
I would start with a plug change. Start cheap and work your way up.
Keep us posted. I'm hoping its all fixed. Sometimes its just simple things.
There should be a bleeder valve on the housing. A basic Phillips or flat head that you screw out. Bleed it until its only coolant.
Is the system free of air?
The cooling system is self pressurized and aides in maintaining a cool temperature. If your pressure cap is faulty, it may need replacing if its not...
I second the SCT. And not to get off subject, but I came from a GTP as well. Loved that car. =) ZZPerformance was my site.