Ok, found the answer. Changing the battery resests the computer. To restart it you have to touch the 2 cables together, hook them up to the battery. Then put in your key, turn to the start position, but don't start the truck! Let it go through all the lights blinking and all that crap. after it checks everything out, then crank the truck and let it idle for 5 minutes. It will really act weird for a few minutes, then it will smooth right out. Was told about this by a GM Tech, and it worked 1st time.
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