I have a 1990 Olds Cutless Supreme, I have problem with RPM drop.

Asked by Apr 13, 2014 at 09:45 PM about the 1990 Oldsmobile Cutlass Supreme

Question type: General

Sometimes when stopped at light RPM drop low and when I go to take off car stalls.
Usually if the air-conditioner is on the RPMS stay up and engine runs fine.

3 Answers


IAC valve sluggish , carboned up

1 of 1 people found this helpful.

Possibly dirty iac. But if running fine with ac on I tend to suspect dirty throttle plate causing your issues.

1 of 1 people found this helpful.
Best Answer Mark helpful

It was the dirty throttle plate. Sprayed Carb & throttle cleaner and watched the dirt run out. Did this 5 or 6 times and took for a 20 mile test run and it runs like a charm. Thanks

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