Early in the morning i start up the truck to warm it up. i put the truck in reverse and as soon as i put the truck in drive the "reduce engine power" light comes on, then the truck goes "limp mode" (not allowing the truck to go no more than 20 mph in motion). i have to restart the truck 5 times for the "reduce engine power" light to turn off. leaving the "service engine" light on. this problem occurs every morning, no matter hoe long i warm up the truck. i bought this truck 3 years ago from a used car lot, and i didnt start having issues until 1 year ago. throttle body assembly seems to be the issue with all gm vehicles.