2003 GMC Sierra info please

Tiny
SHOWTIME81
  • MEMBER
  • 2003 GMC SIERRA
  • V8
  • 4WD
  • MANUAL
  • 55,000 MILES
Ok first off check engine light comes on for fuel to rich probelly the k&n cold air intake have a throttle body spacer also dident think to much about it ran fine and strong like always, then it started getting real weak check code again o2 sensors so I replaced all 4 of them put my factroy air intake back on with a new filter and changed the fuel filter, engine light went off ideals fine but still had no power but sometimes it hits a burst of power for about 5 seconds then falls on its nose again, and also noticed it want set in gear (manuel) keeps inchin back on a very slight grade thought maybe losing compression? Any info or something else to try would be great thanks.
Saturday, March 29th, 2008 AT 2:03 AM

1 Reply

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
If your air filter was an oiled one, replace the MAF, a lot of problems are associated with these filters, read the codes again for any freeze frame data, the MAF usually does not pop. Or turn the light on due to these filters! Also check for vacuum leaks and clean the TBI.
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Saturday, March 29th, 2008 AT 7:04 AM

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