Idle'n at 1200 RPM?
 

Hi all=
This just started today. 99 2WD 1500 5.9 She's Idleing a bit high. I have a new TPS, checked for vacuum leaks. Hmmm I even cleaned the IAC via removing the TB and replacing the gasket. still high. I have a Hughes Plenem repair kit installed along with a new magnaflow cat and 3" IMco cat back. Maybe a i need a new IAC?
What say you?

RE: Idle'n at 1200 RPM?
 

mine was surging. sometimes high, sometimes normal, sometimes up/down.
fixed by new IAC. about $45 at any parts store. don't forget to take the o-ring off your old one.