'90 200 high idle

Nick Lawrence nick at beol.net
Thu Sep 29 12:14:17 PDT 2011

I am experiencing random high idle (2000+/- rpm) in my '90 200tqa.  
 It will drop when I unplug the ISV.  I have cleaned it, does the fact it always drop when unplugged rule out sticking?
What all inputs info to the ISV control.  I guess turning on the air, or does it only work by seeing a drop in speed?
TIA for suggestions.
Nick  central Ohio

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