Any ideas on this one??

what code are you getting? That is the first place to start.

do you have heads on that thing, or is that a basically stock motor w/ a super charger? i dunno if anderson is heads or not
Paul Perreca

check your throttle body make sure it doesnt stick try cleaning it out if not make sure your gas pedal dont get stuck check fuses then try codes

Definately pull codes. If you don't know how, search for the user name "Jrichker" and he has the info. on how to do it w/ a paperclip in many posts.

It kinda does sound like it could be something to do w/ the IAC.

First though, how many pounds of boost are you running? Do you have a bypass valve? Did you re-route the hose from the oil filler tube to throttle body? With a supercharger that hose should go from the oil filler tube nipple to the airbox INSTEAD of to the throttle body as it is stock; the reason is you don't want to put boost into your crankcase.

Without a bypass valve, you could be pushing too much air at the closed throttle body, which isn't good and I believe it could potentially be causing the problems you describe. Generally though, bypass valves are only necessary for over 6psi or so, I think.

I definately pull codes first thing though.