1996 GMC Sierra trouble code reads third cylinder misfire

1996 GMC SIERRA
248,000 MILES • 6 CYL • 2WD • AUTOMATIC
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AWORLD50
  • MEMBER
  • 2 POSTS
I have a 1996 sierra 4.3 v6 it has 248,000 miles the trouble code reads third cylinder misfire an the check engine light stays on. But after idling for 15-20 minutes the check engine light starts to flash
Mar 8, 2009 at 10:58 PM
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BMRFIXIT
  • ✓Experienced Mechanic
  • 19,053 POSTS
Engine misfiring
check engine light flashing, PCM detecting danger of destroying the catalytic converter
and should not be driven
1st need to check it for tune up, if already done it
check injector and do a compression test
Mar 8, 2009 at 11:50 PM
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