1997 GMC Truck misfire

1997 GMC TRUCK
104,000 MILES • V8 • 4WD • AUTOMATIC
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DOLIHAGI
  • MEMBER
  • 1 POST
I keep getting a random misfire on different cylinders, pressure is good, fuel is good, have replaced plugs,wires,cap,rotor,fuel pump and filter, also have replaced the fuel injection spider,can't seem to shake this problem. Any ideas? Thanks Doug
Nov 14, 2009 at 2:24 AM
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MICKEY-D
  • ✓Experienced Mechanic
  • 304 POSTS
My first thought would be that you have some camshaft lobes that are starting to round off, and when that happens you can develop an occasional missfire. As time goes by, you will start to here a lifter tap, because the cam will wear a pinhole in the bottom of the lifter, and it will loose oil pressure. I believe you will need to replace your cam and lifters.
Dec 31, 2009 at 1:29 PM
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