Hi, I have a 91 grand prix 3.1 v6, my problem is when the engine is warm and you drive over 40 mph the engine starts hesitating, if you let off the gas it will level out and also if you go faster, however as soon as you drive steady it starts again, no engine light showing, I have changed plugs, wires, fuel filter, checked all fuses. I took it to the shop and the machine said the car was running lean and that was all. Anyone have any ideas why it would run lean or what my problem could be? any help would be appreciated oh yeah also when you drive it and stop the engine seems to lope, but when put in park it quits it and idles fine. the car does start up easily and will drive fine until it warms up

Something with the injectors, I would think (for it running lean). Or a dirty MAF or something.

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2004 Impala LS - got some mods
NAIOA Moderator

Making you think twice before picking on Impalas

I was thinking about the injectors, wondering if I could just pull them and clean them. can you just get any o-rings from an auto parts store for them?

o rings are available at most stores, you can't clean them yourself by pulling them, you may be able to replace them for what a reputable shop will charge to clean them (some shops are using stuff that will damage them, and others use just carb cleaner which helps but not much)

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Steve
'97 GTP VS cam, ZZP PCM, and not much else yet

Just an update for anyone that might have same problems, the problem with the car was the egr was stuck with exhaust buildup took it apart and cleaned it then put in a new o2 sensor and the car is running great!!