Question about 2000 Chevrolet Blazer

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Car runs rouhg at 50 mph

When I reach speed of 45 mph to 50 mph the car starts to run rough - when I put on diagnostic machine the engine shows no sign of problem with injectors or plugs. when i engage cruise control at 50 mph it smooths out.

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  • sweilers Sep 27, 2008

    The fuel pump and flow have been tested and is fine on the car and i changed the fuel filter.

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O.k... question... when you punch it... does the car barely go... and the engine reve up? if you gently press the gas... does is act the way it's suppose to? if that's what you have... change out the fuel pressure regulator... and the fuel injector... see if that doesn't work for you... o.k... good luck to you

Posted on Oct 25, 2008

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