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Wierd Idle ?!?!?

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Keithson30

10+ Year Contributor
121
0
Mar 11, 2011
OGDEN, Kansas
When I start the car it used to idle at 2500 rpm. I did a few tests, replaced plug wires, plugs, tested coil pack (as per haynes manual)

I did a boost leak test and no leaks found, went through the :

1G BISS Adjustment

I turned it down to 1000 rpm or so, but once i get to or above operating temp it will idle at about 4500 rpm. I cant stop it what else could cause this ?
 
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