Originally Posted by
Nasty-Z
Check the throttle shaft play in the TBI , the BBC TBI's are notorious for elongating the holes the throttle shaft rides through , causing the exact problem you describe.
As others have said , if the IAC counts are at zero , un metered air is entering somewhere or the throttle blades have been opened up too far .
Does it do the idle creep with and without your scan tool hooked up to the ALDL port , some of the different scan tools I have come across would cause an idle creep if left hooked up to monitor data , never could really explain it ........
TOM