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I am installing a new OE throttle body and it is acting like a vacuum leak 3,000 rpm idle, however no leaks. reinstalled old TB and idles normal.
to start with i had a P0121 loss of power. intermittent code. checked all wiring and no chaffing so i replace pedal switch and TB. now i cant get the TB to idle. the dealer has not mentioned any pigtail upgrades and the plug fits correctly.
any suggestions?
 

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It has a 3000 rpm idle with new TB? Bummer!
Seems your ECU needs to relearn / recalibrate to the new TB.
There is proceedure for that using a good GM programmer.
Check out
http://www.yourcobalt.com/forums/problems-service/21514-cleaning-throttle-body.html
And look at the following and follow instructions on page 6
http://www.gadgetmangroove.com/index.php?option=com_phocadownload&view=category&download=8:gm-drive-by-wire-throttle-body-relearn-procedure&id=2:certified-gadgetman-documents&Itemid=429
 

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You may also have a leak between throttle body and intake. This will also make RPMs high. Make sure gasket isn't cracked.
 
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