Causes for idle to go up

[Dave8338]

It is a possibility, for sure.

I had to replace mine last year as it was doing the same thing, even after the silicone treatment and a little light oil. New cable and all was well.

[jjmaag]

I had the same issue, richening the idle mixture (turn screws out) solved the problem. If the mixture is on the lean side it will hang at a high idle for a while before settling down.

[KEITH KRAUSE]

Sounds like the classic intake leak to me. Check the manifolds.

[Killer2600]

Updated--see first post