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Q: cylinder #3 misfire on 1999 Oldsmobile Alero

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My check engine light comes on and the engine begins misfiring. Scan shows #3 misfire change spark plugs still has misfire any tips ?
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Here is a ton of useful info about misfiring #3 cylinder (P0303 Code) http://repairpal.com/OBD-II-Code-P0303