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Rough idle


armorsquadbliss

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Aight i got a 99 grand prix GT with 60k miles with rough idle. I dont think the plugs ever been changed or the wires would this cause my rough idle?? I dont wanna drop the cash on something that wont help. Plus im getting crap for gas mileage like around 17 MPG highway

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Oh, C'mon, be nice, it's his first post.

 

First thing I'd recomend is chaning the plugs and the wires, oil change, air filter, fuel filter ... a complete tune up - if you've still got the issue after that, then we may need some more information about how and when these problems started.

 

slow O2 sensors can sometimes cause gas milage problems too.

 

--Dave.

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