Question about 2004 Buick LeSabre

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Service engine light flashes and car drives rough

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Means u need to service your car ,change oil , service cooling system ,fluids etc

Posted on Jun 27, 2009

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Posted on Jan 02, 2017

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I have a 1998 GMC Sonoma 4.3 LV6 AT.


Cpuld be bad ignition wires, plugs. Dirty air filter. Plugged up fuel filter. Message me if intrested and I'll tell you how to check.the codes yourself using a paperclip.

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Google the codes you have in the pcm
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2003 Chevy Blazer idles low and rough and accelerates rough until about 25 or 30 mph. Afterwards, it drives great, but the service engine light continues to flash.


Flashing service engine lights are very bad, means there is a problem that can potential cause harm to the engine. Sounds like you may have a bad coil. Take it to a place like Autozone which can check the check engine light. They'll give you a print out that will give you a better idea on what's going on. If it's a misfire on a cylinder or two, check plugs and coil, also could be an injector.

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The trans is shifting rough due to the engine issue. Is CEL light on? DTC codes?

Check Engine Light flashing or solid on?

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you have a misfire, the eng light flashes,avoid driving it , or it can damage the cat converter,i dont know what repair was done, but if you replaced the spark plugs one may be damaged, or incorrect plug gap can cause this concern.

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You need to have the system tested for trouble codes, Kragen and Autozone parts stores do this for free.

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Engine light is flashing on, and is running rough!


WHEN THE LIGHT IS FLASHING IT MEANS THAT YOU HAVE A MISFIRE. I SUGGEST YOU REPLACE PLUGS AND WIRES. BECAREFUL DRIVING BECAUSE ALTHOUGH UNLIKLY, IT COULD BE MORE SERIOUS AND CAUSE A FIRE

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