I just bought a 2002 Saturn SL1 automatic with 57,000 miles and I just noticed that it idles rough, sputtering like it's going to stall out, when sitting at stop lights and stop signs. Oddly enough, when I turn the air conditioner on, the RPMs increase by about 50-100 and the problem goes away. I also don't have any problems while driving; only when stopped. The check engine also just came on. I had the computer codes read at Advance Auto this morning and it came back as cylinder #1 misfire. Any idea what it might be?
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My 2002 Saturn SL has 138,000 miles on it. I have the same type of problem, but the misfiring tends to occur more when it rains or is wet outside. The engine will sputter after I start it and act as though it's going to quit. When I shift into reverse and drive, I almost have to keep my foot on the accelerator so it doesn't kill on me.
Another question: How do I know when I my EGR valve needs to be replaced?
It was the intake manifold. Thanks
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