Edgar Posted January 26, 2016 Report Share Posted January 26, 2016 Have a 94 Cutlass Supreme convertible with 3.4L that revs up high upon start up, then quickly drops almost to the point of stalling. Just a slight touch on the pedal and it revs up again. It will do this for several minutes before it finally smooths out to drive. On the road, it runs fine. No code errors showing. Have checked about every possible vacuum leak imaginable. Makes no difference whether the engine is warm and sits overnight, the same thing happens. Any ideas? Quote Link to comment Share on other sites More sharing options...
19Cutlass94 Posted January 27, 2016 Report Share Posted January 27, 2016 First thought would be sticking IAC. Any codes? Might wanna get a scanner and see what's going on too. Quote Link to comment Share on other sites More sharing options...
55trucker Posted January 27, 2016 Report Share Posted January 27, 2016 as stated in the other thread....intake gaskets,.... if you disconnect the O2 sensor when in closed loop (engine hot) or with a scanner force engine service mode does the problem return? Quote Link to comment Share on other sites More sharing options...
Edgar Posted April 7, 2016 Author Report Share Posted April 7, 2016 Sorry for the delayed response, but the weather finally broke enough to begin tinkering with my 94 vert's engine again. Your suggestions were right on! The problem was the lower intake gaskets. Replaced them and it runs like a charm. Quote Link to comment Share on other sites More sharing options...
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