I would like info on this too. My gt stumbles now on the highway at times, but doesn't seem to have any lack of power. I added a 1/2' copper pipe cap with a 1/4 hole drilled out to the iac line before the plastic black box to help the high idle drop. It helped the hanging idle, but it still stumbles at highway speeds while the ac is on. Could this just be the puter is still learning the airflow patterns? It seems every time my car wants to slow down while cc is on it stumbles.
I read it takes about 3 cycles of the ignition to learn the pattern, but I think I am past that.
I also read that the pipe cap worked on older gt's and that I need an iac restrictor plate instead of a cap... One side drilled to the iac hole size and the passanger side hole being smaller (depending on mods)...?
K&N fipk2 CAI, flowmaster 40 cat back, accufab 70mm tb/p, xcal2, 3.73 frpp gears, Steeda Tri-ax, Mach grill del.
255rwhp 295rwtq Needing more