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Originally Posted by pushrod243
this is common ith the ramjet 502. I talked to few GM engineers at SEMA who admited they are working on a cure. They claim the servo in the ISC does not react fast enough as the motor returns to idle. Mine is better since I switched to the fast xfi system but still is annoying. I havent look harder into a fix since.
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look at the throttle follower, and ramp it up higher to slow the return to idle.
Jody