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clean/replace distributor cap clean/replace spark plugs replace spark plug wires fuel injector cleaner may help, if equiped with a TBI or injection carburetor cleaner for carbs. check timing change fuel filter. replace catalaytic converter. does it smoke. if so what color? (blue, burning oil, black flooding,etc) does exaust smell like fuel (first5),rotting eggs(cat.conv.). does it backfire or diesel ( timing,incomplete burning).

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โˆ™ 2006-04-22 14:30:32
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Q: If you have an 89 GMC and it started missing very slugish on take off and almost stalling frequently when your driving what do you need to do?
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That could be a number of things. I would bring it to a dealer, because they can check the O2 sensor on those early fuel injection systems. The O2 sensor determines how rich or lean to run the engine by monitoring the exhaust gasses. My friends 92 GMC had this sensor go out on him and it went out reading "rich", and would flood out when trying to start, then pump so much gasoline when driving that you could smell it in the cab. Yours probably died out in the "lean" or idle position, and dose not respond when you want to accelorate. Explaining your slugish driving. Your transmission bands, and fluid may be another thing to look into, but really look into the O2 sensor Hope this helps.

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