Did you disconnect the battery for 5-7 minutes while/after installing the new IAC valve? Then after that did you let it idle for at least 15 minutes so the PCM could learn the new idle air trim values?
- 2003 GT, UPR X, FRPP 24lb/h, Magnaflow, PP 70mm TB & plenum, Delta Force tuned,
Steeda UDPs, Ralco flywheel, RAM HDX clutch, 3.73s, 262 rwHP/305 lb-ft.
New ride (7/1/2013) 1998 Mercedes SL500-5.0L 32V VVT 326/347 HP/tq