Mechanics

P0300 MISFIRE & LOSS OF POWER

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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Musicmandon
October 1, 2012.




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.

KHLow2008
Oct 1, 2012.
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

Tiny
Musicmandon
Oct 8, 2012.
What is the trouble code?
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KHLow2008
Oct 8, 2012.
P300 random misfire (90%) cyc 4 10% but I think that was by chance

Tiny
Musicmandon
Oct 8, 2012.
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.

KHLow2008
Oct 8, 2012.

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