Six problems related to car throttle sticking have been reported for the 1999 GMC Sierra. The most recently reported issues are listed below.
Throttle body is sticking, and it is hard to press on gas. Also, hard to stop.
Throttle sticks when pressing down to take off. Vehicle jerks and can go faster than intended if brakes are not applied quickly enough. Dealer stated they have heard of problem, but consumer has to come up with money before they can look at vehicle.
Throttle body sticking. Dealer notified, and informed consumer no recalls on that problem. Feel free to provide any further details on this matter.
While backing out of garage, truck went full throttle without foot being on the accelerator pedal. Driver had to stand on brake and turn ignition off to get truck to stop. Truck was taken to the dealership. Throttle body was replaced due to sticking.
Throttle body sticks. It is hard to push the gas pedal to try to acclerate at a slow speed. When finally pushing pedal in throttle will snap towards the floor. Contacted dealer, and dealer has tried to fix everything. They could guess what has been causing the problem but with no success. Each time repair was done, it lasted only 8,000-9,000 miles. The consumer believes the problem was very serious and affects other drivers too.
Throttle body sticks while driving. Had built up dirt and varnish. This caused vehicle to lunge forward when pressing on pedal. Drivetrain makes a clunking noise due to a lack of lubrication. This can cause teeth not to mesh correctly.