Question about 1993 Jeep Grand Cherokee

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Hard starting,runs very rough,kicks and bucks even after fuel

Additives have been added

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  • Mike Butler
    Mike Butler May 11, 2010

    Any trouble codes?



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Replace the fuel pump. $300-500.

Posted on Dec 30, 2008


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Idling rough

Most of the time this model idles rough the fuel pump is responsible. Other causes the Map Sensor, vapor in the fuel line, dirty spark plugs, and in some cases bad fuel. You can try using good fuel system cleaner and filling up with high octane gas, it should be noted that additives added to some commercial gas suppliers don't sit well with some cars, (Shell sells good gas) and going for a long ride and see if that clears it. In addition you might try adding riselone to your engine, or marvel mystery oil.

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