Chevy 2007 1500 4+4

[Felt]

Had mechanic put his snap on computer on truck because it was shutting off after starting and driving about 100' would start back up and not do it again for awhile it said it was the tps throttle position sensor he's our fleet mechanic and he messed with it and made it worse barley got home had to ride brake and throttle when I slowed down if I took my foot of gas it shut off so replaced tps and now it idles fine but still wants to cut off do I need to have it reprogrammed I had to when I changed out throttle body a year ago

[swathdiver]

It has to complete a relearn.  

[Felt]

Thanks so I need to take to dealer to have reprogrammed