Question about 2000 GMC Sierra 3500

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2000 GMC Sierra 3500 losing acceleration power

While going down road everything is fine for about 100 miles. When you start up a steep grade where you need a lot of throttle, all of a sudden the engine will throttle down to a little above idle. After you pull off of the road, the engine runs normal until you give full throttle and then engine smothers out again. When you let off throttle, engine runs fine. After engine sits and cools off for about an hour, it will run fine and pull hills good for another 100 or so miles and then start doing the same thing all over again. Engine does not skip during this problem but it just won't take the throttle. Please help!!

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Next time it happens try spraying water in mist form around the throttle body if it bogs, replace the throttle body gasket. if it doesn't bog you may have a bad wire wait until dark start the vehicle have someone feed the fuel very slowly and watch for arching from a wire it will be easy to see when it is dark, replace that wire.

Posted on Apr 18, 2017


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Posted on Jan 02, 2017

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SOURCE: 94 Legacy Wagon stalls on grade

Sounds like it could be some water in your Carb, i would recommend cleaning it out, Also it could a blocked air filter

Posted on Jun 03, 2008

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youare dealing with a spark plug or sparkplug wire thats breaking down causeing a mist thats what your surge is i ypuld change both

Posted on Jul 07, 2008

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SOURCE: Loss of power, transmission not shifting

i know the camp verde hill of which you speak , last vehicle in the shop with that same scenario , after doing everything possible including a catalyst check , as we could not duplicate the problem , we replaced fuel pump at owners request and next trip he confirmed it was a fix .

Posted on Jan 13, 2009

  • 1861 Answers

SOURCE: loses power on steep grade

Sounds like you need a clutch replacement.

Try this. Go somplace where there are no cars, and no possibility of running into anything. Stop the car. Set the park brake. With the engine running, put the vehicle in 1st gear. Hold the foot brake pedal, and give it gas, and let out the clutch slowly.
If the engine does not stall real quick, the clutch disc is bad.

Posted on Jan 24, 2009

  • 2920 Answers

SOURCE: 2004 GMC Sierra Heater does not heat on low RPM

check your coolant level on the radiator

Posted on Feb 03, 2009

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youare dealing with a spark plug or sparkplug wire thats breaking down causeing a mist thats what your surge is i ypuld change both

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