Almost fells like its choking and dies lol i turn it on but truck wont stay on and idle.....so i rev engine to keep truck on but all im doing is playing with the rpms as i watch them go down like its going to shut off then i step on gas and rpms move up but as i let go rpms shoot back down to 0 and shuts off. then starts right up and it drives like a champ ????
See if cleaning the throttle body helps -
TUTORIAL HOW TO clean Vortec Throttle body 5 7L Chevy Gmc
SOURCE: The rear problem with a 1999 gmc sierra truck
do you know if you have a limited slip rear diff?
if you do your grease is worn out or if the fluid was replaced it need to have a friction modifier put in the diff (can be found at any auto part stores.)
if its not a limited slip diff you might have spider gears going bad. then you need to remove the cover on the diff and inspect your spider gears
and these are the spider gears
and this is what a limited slip looks like
good luck
and dont forget to rate my answer
thanks
paul
SOURCE: 2003 GMC Sierra heater Blower wont shut off
My 2003 Sierra's blower came on by itself in the garage while I was sleeping and ran the battery completely down. I had to replace the blower switch located under the glove box next to the blower at the bottom of the right corner of the dash. The switch is in front of the blower and held in by two screws. Disconnect the two wire connections. This is a "dealer only" part and cost me 65.00. Also check the wire harness with seven wires connected to it for melted plastic. It will be marked "ABCDEFG". If it has melted, you'll need to replace it. Pay attention when reinstalling either part, that the wires "ABCDEFG" match the switch in that order.
SOURCE: truck just shuts off
I own the same 3500 GMC 6.5 diesel truck with the same problem. We replaced the brain under the upper turbo hood and it fixed it pronto. No more shutoffs
SOURCE: Engine bogs down and shuts off while driving down the road.
could be vgr valve or the brain box trying to go out vgr valve u can remove and scrape the carbon deposits off using a wired brush alot of times when it is the vgr valve thats all it is they vary rarely have to be replaced
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.
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