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do a routine tune up. normal parts replacement parts. If no success then take it to a parts store and ask them to put it on a scan tester. It may help identify the problem. It could be many different things that could cause the misfire. Things from the main computer to a dirty, or fouled plug. It could also be bad gas, clogged filter, or injectors. lots of possible reasons. The scan tool is the best place to start. hope it helps. duboff

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Q: How do you stop the engine from misfiring in a 2002 Ford Focus?
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