Question about GMC Sierra

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I have a 1984 GMC high sierra, I can start it and it will idle, but once I press the gas pedal to rev it, or pull it and gear and try to move it, it stalls out, any ideas what could be causing this problem?

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  • GMC Master
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Generally speaking I would guess lack of fuel. The carb has three circuits - - idle, cruse, and accelerate. It can be ok at idle but not getting enough fuel when you try to speed up.
Could also be a vac leak or other problem including the fuel filter.

Posted on Jul 31, 2013

Testimonial: "Thanks, my dad told me to check the fuel lines because it sounds like there is too much air getting in, so im going to check that out tomorrow. Again thanks for the tip :) "

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SOURCE: wont hold idle will start with foot depressing gas pedal will run with foot on gas but stalls when foot removed

Check and clean Idle air control valve. Make sure its responding to signal as well. Also make sure ther are no vacuum hoses disconnected. This may not be a "cure" but it's a good place to start.

Posted on Apr 14, 2009

  • 1 Answer

SOURCE: My '96 Tracker starts and runs fine but when I put

its more than likely its your timing, check to see if your crank shaft TDC marks align correctly, I also had this issue and it was the woodruff key in the crankshaft rod broke which throughs your timing off. my key hole was in really bad shape so i J B welded it which worked for a little while

Posted on Dec 18, 2009

Molson02536
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SOURCE: 99 GMC Sierra 5.3L sputtering and hesitating

Check TPS for smooth and linear electrical response over the entire range of motion. If the response is jumpy or erratic at all, replace TPS.
Thank you for using fixya and good luck.

Posted on May 11, 2010

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idle my be offset or a hose my be off as well

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is the car is idling o.k between 750-850 rpm, before you pull away? if it isn't then check your plugs injectors idle control. if it is but the car move's slowly away and you are using high revs it could be a slipping clutch or if automatic transmission worn bands or torq converter. also check for breaks binding.

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