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Misfire On Cylinder #4 ?

sumdig

By sumdig
in Ask A GM Technician

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sumdig Enthusiast

sumdig

Posted
Posted

My 1996 silverado (5.7) has a misfire on cylinder #4. Drove it over the weekend with the scan tool attached and discovered that it only occurs once the truck reaches approx 70 mph. Truck runs perfect other than that. I have replaced cap, rotor, wire and coil. Seems like the misfire should be associated with RPM more than speed.

 

Any ideas are welcomed, this has me stumped.

 

Thanks in advance.

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