2002 GMC Sonoma #3 cylinder intermittent misfire

2002 GMC SONOMA
86,000 MILES • 4.3L • 6 CYL • 2WD • AUTOMATIC
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TOMMYB79
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  • 7 POSTS
# 3 cylinder seems to be misfiring off and on.
I have replaced everything from the coil down to the spark plugs, but have had no success.
Any ideas?
Thank You.
Sep 26, 2015 at 5:11 PM
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CAR-MAN145
  • CAR REPAIR CONTRIBUTOR
  • 321 POSTS
There is an injector web inside the upper intake and they have many problem with these injector plugging up. Most cleaners won't work so the injector needs to be replaced
Sep 27, 2015 at 1:12 AM
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TOMMYB79
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  • 7 POSTS
Thank you.
Is it much of a job?
Sep 27, 2015 at 2:52 PM
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CAR-MAN145
  • CAR REPAIR CONTRIBUTOR
  • 321 POSTS
I would say on a scale from 1 to 10 its a 5 so not to bad but it takes some work.
Sep 27, 2015 at 11:37 PM
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TOMMYB79
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  • 7 POSTS
Yes it was a bit of a job. No problem though. As far as the injector goes, it was fine. Glad it wasn't the problem. Found out I can't just replace one, I have to replace the whole web. It is an updated web The injectors are in the intake, not the poppet valves. Thanks for the help.
Oct 14, 2015 at 1:31 PM