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P0300 MISFIRE & LOSS OF POWER

  • Tiny
  • musicmandon
  • 2000 GMC Jimmy
  • 128,000 miles

I have a 2000 Jimmy 128k. I loose power & get a miss fire code under load. When I tow up a hill start feeling loss off power. Almost dies. Also happens cold when going up a hill. Changed the obvious (plugs, cap, rotor, also cam & crank sensors) and use only Delco parts

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Monday, October 1st, 2012 AT 5:58 PM

5 Replies

  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Have the fuel pressure checked. You could have a clogged fuel filter affecting the fuel supply resulting in loss of performance.

If the Malfunction Indicator Light is shoiwng, get a scan to cehck for trouble codes.

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Monday, October 1st, 2012 AT 6:20 PM
  • Tiny
  • musicmandon
  • Member

Checked fuel line, it had some fluxuations. Changed to a Delco fuel filter. First day out up inclune in road (first 10 mins) idoit light on Misfire

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Monday, October 8th, 2012 AT 5:34 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

What is the trouble code?

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Monday, October 8th, 2012 AT 5:41 PM
  • Tiny
  • musicmandon
  • Member

P300 random misfire (90%) cyc 4 10% but I think that was by chance

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Monday, October 8th, 2012 AT 6:03 PM
  • Tiny
  • KHLow2008
  • Expert
  • 41,994 posts

Basics have been covered so you need to go further into diagnostics.
Have you checked the fuel pressure and air filter?
Try cleaning the MAF.

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Monday, October 8th, 2012 AT 6:10 PM

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