In park or nuet. idle is fine. When I drive it goes up to about 2000 and won't come back down until I make a complete stop. ?? I replaced isc and reset everything. Any idea??? 93 Eldorado

Have you cleaned the throttle body and plates?

Yes I did. Thanks.

What are we working on car or a truck 4 or 6

93 Eldorado 4.9L

Is the ISC adjusted correctly?

Yes. I believe so.

Any binding in the throttle linkage? How did you adjust the ISC?

I removed isc control took idle to 550. Had the plunger on isc all the way in. It was about 1/4" from throttle when I put it back on. ??

With the base idle at about 450 and the ISC fully manually retracted and unplugged, I set my clearance at .030. Seemed to work well.