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Originally Posted by JDLB
I have the 3.4 DOHC in a '92 Cutlass Supreme that has the same problem. I already changed the IAC and upper intake gasket, but it still runs at 1500-2000 RPM's when i start it, and then it will sit there and pulse the RPM's when in drive or reverse. I can't figure out the problem.
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I have the 3.4 DOHC in a 94 Grand Prix GTP and when I bought it it had a serious idling problem. I changed the intake gaskets and that fixed it. Then I just recently tore it down to the block to fix an oil leak at the oil pump drive shaft (distributor). Now that I have it all back together I am having problems with it staying running. I will start but idles very rough not erratic like before and once it warms up it will stall out when idling whether in gear or not. I have checked for vacuum leaks and have found none, not sure if it is a sensor but the SES light did come on once, but has since went back off. Any other ideas???