I am running the terminator x with wilson 4500 throttle body setup and a vacuum. Pump so its somewhat similar to yours.. you need the IAC to be around 5-10% at idle. Otherwise it can't drop the idle any lower if it's already at 0. You either have the primary or secondary blades open too much, a vac leak or incorrect timing. First make sure the secondary adjuster screw is backed out as that will increase idle and not as easy to check as the primary screw. What's your MAP at idle? 60kpa for ex?
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1969 Firebird
525 IA2 Aluminum Block
Edelbrock Wideport heads
200 4r trans
3.89 9"
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