1995 Bonneville eratic idle
I recently had the throttle body cleaned on my 1995 3800 SC Bonneville. It idled perfect before the work was done but now it revs up for a few seconds and then barely idles after that. I have replaced the Idle Air valve and the Egr valve and know difference. I have checked for vacuum leaks and found none. The engine code has always showed bad Egr valve for last few years but have replaced that twice. The engine does not respond as it should but runs fair.
There must have been something damaged when the garage removed the throttle body for cleaning.