spark plugs are used to ignite the fuel-air mixture in a petrol/gasoline engine.

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2002 chevy cavalier loud knocking after tuneup

02' cavalier knocking loud after tuneup. Starts and runs perfect except loud knock. Afraid to drive fearing piece of broken sparkplug ruin car. Went in with magnets to remove any metal left behind ...
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Ford Expedition ignition cable problem

Is this the underlying problem or a symptom of something else?? I have a 99 Ford Expedition that has a knocking and pinging problem. Two different mechanics have narrowed it down to the ignition ...
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Misfiring plugs

My Kia Sportage has been running on only two of 4 cylinders. The 2 plugs don't fire at all even when they are replaced. The coil works perfectly if they are interchanged. Wires are in perfect ...