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try changing the distributor cap , Faulty emissions system components , Low or uneven cylinder compression pressures , weak or faulty ignition system , ( Vacuum leaks at the throttle body, intake manifold or vacuum hoses . spark plugs incorrectly gapped ? check the spark plug cables..if they're not in a specific order on the distributor its gonna miss fire..check your owners manual to see the timings

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Q: What is wrong with your car if you have changed wires sparkplugs and fuel filter but it is still missing real bad?
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