Hitting only on four cylinders

1990 CHEVROLET CHEVETTE
154,000 MILES • 3.7L • V8 • 2WD • AUTOMATIC
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JEFF RANOWEL
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  • 3 POSTS
Started tuning on maybe four or five cylinders pulled and replaced spark plugs, they were coated with unburned gas and carbon. still starts, but running really rough could it be distributor cap something like that?
Nov 23, 2016 at 2:23 AM
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JIS001
  • ✓Experienced Mechanic
  • 3,412 POSTS
If they are wet with gas then do a compression check first.
Nov 23, 2016 at 3:34 AM
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JEFF RANOWEL
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  • 3 POSTS
Compression good I am thinking computer?
Nov 23, 2016 at 5:43 AM
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JIS001
  • ✓Experienced Mechanic
  • 3,412 POSTS
Have you tried swapping the fuel injectors to a different cylinder to see if it does the same thing on a different cylinder?
Nov 23, 2016 at 7:15 AM
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JEFF RANOWEL
  • MEMBER
  • 3 POSTS
I have some bad injectors I believe. thank you.
Nov 23, 2016 at 7:48 AM
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STRAILER
  • ✓Experienced Mechanic
  • 55,691 POSTS
Please let us know happens so it will help others. I want to say Corvette not Chevette?

Best, Ken
Nov 26, 2016 at 12:21 PM
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