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Car shuddering when accelerating


bazz34
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Help please

Last few days I've noticed my car shuddering when accelerating. After looking into the engine, I find one spark plug loose. I refit and take car a run. Engine mgmt light comes on. So I connect it to a obt2 and check error. Says misfire on that same spark plug. So I buy new plugs and refit. STILL HAPPENING!!

at an end now. Don't know what else to try

Also getting an air hissing when sitting idling then rev the car. Like there is air getting in somewhere...?? (Almost like a dump valve noise)

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