Throttle body was changed on a 2001 Chevrolet Silverado 2500 6.1L the truck idles rough then dies. How do you reset the computer?

Robert, have vehicle scanned for diagnostic codes. Check for vacuum leaks and if you have not done recently give vehicle a complete tune up cap,rottor,wires,plugs,filter's,etc, including injector/throttle body cleaning. Check the attached links,instruction and guides, Good luck
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If it dies when you are coming to a stop after being on the freeway, chances are the torque converter solenoid is sticking in the transmission.
If it is doing it around town, I would look at the throttle body and idle air control valve. The computer controls idle speed by regulating air flow into the throttle body.

in my 03 1500hd had real rough idel clean the throttle body my truck idels perfectly now dosent take 30min and throttle body cleaners 8$ at autozone theres how to videos on youtube thats what i did

Dissconnect the battery for a while. It will "re-learn."

yea id definately try cleaning ur throttle body 1st. My 03 1500hd had the exact same bad idle after my battery went bad it would die at lights unless i kept foot on gas i cleaned throttle body runs perfect now took 30min cost 8$ for cleaner at autozone and theres how to videos on you tube

Check your fuel pressure it should be 48-55 with key on engine off.If its not within specs replace pump.

By chance, did it start idling rough while you had the defroster on, or the A/C? This is a very common problem after the battery is disconnected AND the defroster or the A/C is on. The defroster uses the A/C to dry the air. To fix this, spend about $7 on a can of throttle body cleaner. Disconnect your battery again, and clean your throttle body. After finished, reconnect the battery and drive for about 5 miles with the defroster or A/C off, this will allow the computer to reset and relearn the newly cleaned throttle body. When you changed your battery, you computer reset and thought the throttle body was clean, therefore you get rough idling when the defroster or A/C is on.

Sounds like you have a dirty throttle body. This truck has whats called "drive by wire". There are no throttle cables. If you remove the air intake tube you can carefully clean with some carb cleaner and a rag. Reinstall the tube and let it idle for a few minutes so the computer can relearn the base idle. If this does not work you may have a defective throttle body.

Try cleaning TAC valve, spray throttle body cleaner in upper right of opening clean well.

ck to see if your throttle body is dirty. Buy a can of berrymans b12 carb cleaner (spray) and grab a friend. Take off air intake and expose throttle body. Have your friend start the engine and throttle up to 2000/3000 rpm and spray cleaner all arround throttle body while running. It will run like **** while you empty 1/2 to 3/4 of the spray into throttle body. Turn off and disconnect battery for at least 5 min to reset computer. reconnect and presto good rpm's no more slow idle and dying.