[Shotimes] 89 SHO Idle Issues - Help Please

[Epperly]

It not bad if you use a 5" long 3/8" drive allen wrench. With an extension
on the allen place the wrench under the snakes add another short extension
and ratchet away. Use some never-seize on the bolt when replacing.
        Ken

> My instinct is that the problem will be an Idle Speed Control valve fault
> (or its associated electronics from the PCM).  The ISC costs about $55
from
> AutoZone and is not too terribly difficult to replace.  Well, that bottom
> screw is - it takes a LOT of Allen wrench repositioning.  AZ refers to it
as
> the "Throttle Air Bypass" valve.