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A Pontiac G4 with acceleration problem, above 5MPH in neutral, constant variations from 600 to 900 RPM and if in drive, variations sometimes kill the engine.


is the air conditioning on?

is the air conditioning on? I have a 2003 sunbird that does that when the air conditioning is on, and when a/c is off, the engine idles normally. also if the heater is on defog, or combo defog/floor, the air conditioner is on even if it is cold outside. (dries the air for better defog) It is annoying, but the a/c puts considerable load on the engine at low RPM, and the compressor turns on and off intermittantly

sounds like an ignition

sounds like an ignition problem. have the computer scanned for misfire codes and proceed from there. post any codes that are present here so that we can help you to diagnose the problem.

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