It will take a few miles of driving for the ECM to catch up to the new throttle body. Assuming it was an OEM replacement, its cleaner than the old one, so the air flow is different. 20 minutes of driving should do the trick...if it doesn't then you have a different problem.
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You need to use the Tech II scan tool from GM to perform this relearn process. You can try disconnecting the battery for 30 minutes, but you more than likely will need the relearn procedure done at your local dealer.
clean your throttle body. check for codes; you might have a map sensor problem, or your tps might have a dead spot. 9 times out of ten it is a dirty throttle body; the iac can't react fast enough to regulate air when the small gap adjustment of the throttle body gets contaminated with a tarry buildup.
if you follow the air cleaner/filter tube to where it meets the motor you will find the throttle body and it is mounted in the throttle body on the opposite side of where the gas pedal cable mounts. it has a 4 wire plug i believe.
P2176=Throttle Actuator Control System - Idle Position Not Learned Did you use all you old sensors,or is some of them from the new engine,I would swap out the IAC sensor or check for wires not hooked up. If it can't relearn to idle the Idle air control might be different then your old one,but its not registering with the computer
Buy a can of Throttle body cleaner and follow the instructions on the can, make sure you buy Throttle body cleaner. Carburetor cleaner is to corrosive to the gaskets used in the Throttle body's. The basic way to use the Throttle body cleaner is to just spray it into the Throttle body, working the Throttle blade and making sure that you also clean the Idle Air Control passage ways. As long as you follow the instructions on the can, you will have no problems. Just note that different Throttle body cleaner products will have different instructions, so read before you use. Just pay attention to the throttle blade, it's common for Carbon to build and can cause the blade to stick from time to time.
it may not be a vacumn leak from a line,check the throttle shaft for movement,for example,i had a 89 1 ton 350 and my throttle shaft was moving around a lot and in order to keep it from idling high,i had to kick the throttle pedal.But also check the idle air control valve,which is the round sensor on the side of the throttle body.
NO, PROBLEMS ARE NOT RELATED SEAT MODULE NEEDS TO BE PROGRAMMED AT CHEVY DEALER TO FIX ISSUE. IF YOU HAVE AN AUTOMATIC HVAC CONTROL UNIT WHEN YOU REPLACE THAT YOU WILL ALSO HAVE TO HAVE THAT REPROGRAMMED WITH THE LATEST UPDATES. BUT THERE ARE ALSO A LOT OF PROBLEMS WITH THE ACTUATORS THAT CONTROL THE MODE AND TEMP DOORS. THE ONLY POSSIBLE WAY TO DIAGNOSE THE PROBLEM CORRECTLY IS WITH A GM SCAN TOOL. GOOD LUCK
Clean the throttle body- if you remove it you will need to replace the throttle body gasket when you put it back on. If its still under warranty 3yr/36,000 miles it may be covered under warranty due to a TSB.