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Old 02-16-2003, 07:38 AM
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Post Stop light surging

I have a problem with my wifes everyday driver, it will surge at stop lights and the rpm will go from 500 to 2000 while it surges at idle and will eventually stall. It starts doing this after it warms up a few min. Also while driving it seems to run ok until you let off the throttle to turn or stop the rpm starts jumping up and down while the engine surges. This is a 87 Pontiac Grand AM 3.0 V6 any ideas would be appreciated my 32 ford is running great. Steve

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Old 02-16-2003, 08:05 AM
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Change the fuel filter and add 2 cans of dry gas.
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Old 02-16-2003, 08:27 AM
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Usually in a fuel injected car when the idle starts to surge or 'hunt' it indicates a sensor is going bad or out of range. It may not be bad enough to trip a check engine light yet. First thing I would try is to remove your air cleaner assembly and clean your throttle body good. If your car uses a MAP sensor instead of a MAF sensor you can run it without the air cleaner assembly on and spray throttle body cleaner (carb cleaner) into the throttle plate while holding the throttle open some. Same way you would do it with a carbed engine to clean out the throttle plates. If cleaning the throttle body doesn't help you may want to have her looked at, could be a TPS or other sensor going bad causing the computer to surge the idle.
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