Hi all! My 2001 Grand Prix SE has started to idle erratically here in the last few weeks. It's most noticeable when I'm stopped. The idle will go from about 7-800 RPM down to 2-300, like it's about to die. It has died once already at a red light. At highway speeds (50+ MPH) I'll feel it "buck" frequently. I haven't noticed any bad smells. It idles like this when the engine is cool or warm, it doesn't seem to matter. I've changed the spark plugs/wires, but haven't changed the air filter/fuel filter in awhile. Assuming these aren't the cause (my luck is never that good), what else could it be? The engine is the 3100 V6 with 140,000 mi. Any suggestions would be great!
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