Matt,

Couple of adjustments need to be checked. First, the idle adjustment on the engine. This model may be electronic but can be checked through program. Inspect the throttle cable to make sure it is not damaged. Most lifts will still move after letting off the throttle unless the brake pedal is pressed. The brake pedal is two part. Inching pedal when first pressed putting the transmission in neutral. Actuates brakes when pressed further to stop the truck. All this happens as quickly as you press the pedal. Good Luck.