2005 Gmc Envoy Had Car Check Advance Auto Part Show 1mis Fire Tapping Change

2005 GMC ENVOY
140,000 MILES
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I had my car check at advance auto part.it show no.1mis fire.it was tapping so I change plug,wires,air filter and throttle body and ignition coil on no.1 and it still is tapping.i also change oil filter.i check all coil all had spark.
Mar 24, 2013 at 2:40 AM
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JACOBANDNICKOLAS
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Have you checked to make sure the injector is working on that cylinder? If it is, check to make sure engine compression in that cylinder is good.
Mar 24, 2013 at 3:45 AM
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