[Palmer41]

03 silverado codes p0120 p0220 p1516. Wouldnt start for more than 30 seconds, Replaced throttle positioning sensor and harness. Started for 10min and when i touched the brake it died and will not start back up, and threw the codes again after it died. Need help please

 

[xPosTech]

There is a very good procedure to track this down in this thread.

http://www.ls1truck.com/forums/powertrain/29020-p0120-p0220-p1516-codes-help.html

Ted