Welcome . Besides the IAC valve, also put in a bottle of HEET. Change air filter and check for vacuum leaks. Any CEL codes?

Edit. Is it an ATX? And was the surging idle coupled with a loud foghorn sound? If it is, it could be the "moose".

Last edited by Tony2005; 12/06/05 01:12 AM.
"Always do the cheap and easy ones first." 1996 V6 ATX 96K miles