2003 GMC Sierra Flashing chk engine

150,000 MILES • V8 • 4WD • AUTOMATIC
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ACOOK3300
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  • 1 POST
Chk engine light flashes like a major miss fire between 50-60 mpr or apx. 2000 rpm. There is no apperent miss and no loss of power, really no signs of driveability faul. the miss fire counter on the scanner shows cyl 5 missing like crazy and i even swapped plug wire and coil with another cyl and there was no change on the counter. i was thinking pcm or something, does this sound like a common problem, any incite will help
Sep 18, 2010 at 11:18 AM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
This is a specific cylinder misfire you should check sparkplug, compression and injector on #5 cylinder.
Sep 19, 2010 at 4:37 PM
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