Edgar Posted January 23, 2016 Report Share Posted January 23, 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...
Nas Escobar Posted January 23, 2016 Report Share Posted January 23, 2016 Lower Intake Manifold Gasket. I had the same issue when I bought my 94. The LIM gasket is made out of nylon (PLASTIC). Spray some carb cleaner near the gasket and you'll hear the engine rev up as if you were giving it gas. Easiest way to do this is to take off that beauty cover where it says "3.4 DOHC V6" and spray it at the edges, you should see the LIM through some of the gaps. Quote Link to comment Share on other sites More sharing options...
Nas Escobar Posted January 23, 2016 Report Share Posted January 23, 2016 Also posting this in "Powertrain" instead of the Convertible specific forum would have yielded you more views. The engine is not vert specific. Quote Link to comment Share on other sites More sharing options...
Psych0matt Posted January 23, 2016 Report Share Posted January 23, 2016 Agreed with the lim gaskets (and post location lol). I did the ones on my GTP as I had the exact same issue, and after it ran perfect Quote Link to comment Share on other sites More sharing options...
Imp558 Posted January 24, 2016 Report Share Posted January 24, 2016 We need pics of the 'vert! Quote Link to comment Share on other sites More sharing options...
Edgar Posted January 25, 2016 Author Report Share Posted January 25, 2016 Thanks for the ideas and advice on posting. This was my first post. Haven't figured out how to post pictures yet. Quote Link to comment Share on other sites More sharing options...
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