That's pretty much the same experience were having. Oh well, I replaced the IAC and EGR and gave the car back to the owner to see if the problem still exists. Haven't heard back yet but I have some other ideas I need to test out.
Thanks again 
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1990 ex-chp Coupe. Mildly ported Twisted wedges, custom cam,Holley SysteMax intake, 1 5/8" longtubes, Mac prochamber, Flows,Tremec 3550, 4.30's,Griggs subframes, C&L 76mm, 30# injectors,70mm t-body etc. Best e.t. [b]11.94 @ 113.03 mph with 1.488 60ft
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