That was a long shot on the loose plug wire, but I suppose it was a good guess, eh? Glad you found it. <img src="/forums/images/graemlins/kewl.gif" alt="" />

Next problem - you may be right about the IAC - check the resistance of the coils:

IAC Check

If the values are off, replace the IAC - it has been reported that a bad IAC will fry the ECU.

Frank

'89 [color:"white"]G-Raider[color:"white"] [color:"black"]Supercharged 3.0L, MegaSquirt 2, lockup A/T, 2.5" exhaust, 172k, Cibie H4s/Oscar SCs, Hella Micro DE fogs, Cobra CB, Superwinch hubs, LSD rear/Aussie Locker front, Bilsteins, Lifeline AGM, Rust-Oleum