5.3 Idling Problem

[Whaler]

Originally Posted by BAD BOB

Throttle body clean? Sometimes that will make them act weird or could possibly have an intake leak. Some people have issues with the gaskets leaking

Could the gasket idea be why it runs ok after cooling off?

Originally Posted by oldskoolstang

Kinda sounds like a vacuum leak....

I thought that, but why is the problem inconsistent?

You have stand on the brakes hard when this happens (high idle) when coasting to a stop.

Thanks for trying to help.