bazz34 Posted December 10, 2016 Share Posted December 10, 2016 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) Quote Link to comment Share on other sites More sharing options...
mikeyd1 Posted December 10, 2016 Share Posted December 10, 2016 Maybe need new coil pack or leads. That would be my next step Quote Link to comment Share on other sites More sharing options...
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