2001 Chevy Silverado Random Cylinder Misfire on Chevy 1500

Tiny
ZUPCHESH
  • MEMBER
  • 2001 CHEVROLET SILVERADO
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 154,000 MILES
Not sure what the problem is on my truck. I had a random cylinder misfire code, so I replaced the plugs, wires, cap/rotor. That didn't fix it so I replaced the actual distributor. Still not fixed. The truck runs fine at lower speeds but when I get on the highway and accelerate it runs really loudly and won't get up past about 65 mph. Check engine light starts flashing at higher speeds. I thought for sure the tune-up would take care of it but no such luck. Any ideas?
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Monday, November 1st, 2010 AT 10:36 AM

5 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have the computer scanned for code/s-you have a problem within the engine management system that caused the CEL to turn on-This is your starting point of diagnosis, finding out what's going on.
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Monday, November 1st, 2010 AT 10:38 AM
Tiny
ZUPCHESH
  • MEMBER
  • 2 POSTS
Yeah I did that, the code is still coming up as a random cylinder misfire. The same as it was when everything first started.
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Monday, November 1st, 2010 AT 10:43 AM
Tiny
RASMATAZ
  • MECHANIC
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P0300 is normally caused by vacuum leaks and contaminated fuel-
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Monday, November 1st, 2010 AT 10:45 AM
Tiny
ZUPCHESH
  • MEMBER
  • 2 POSTS
Any suggestions on repairs? Thanks for the help/diagnosis
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Monday, November 1st, 2010 AT 10:47 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Start by checking all the vacuum hoses and check the fuel pressure if it within specs -also try running Seafoam thru the fuel system and see what happens
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Monday, November 1st, 2010 AT 10:52 AM

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