'03 Buick LeSabre, 3800 V6, 43K miles: after being warm for a while, but not necessarily running constinuously, the idle starts coming up and can go above 2,000 RPM in park if given long enough. Sometimes playing with throttle, or shutting down and restarting will resolve it to some degree. A new IAC valve fixed it for a few days but it came back. Sprayed the intake down with starting fluid with no results. The nature of the speed increase seems mechanical or electronic rather than from a vacuum
leak but I could be wrong. No CEL codes.
Any help?
leak but I could be wrong. No CEL codes.
Any help?