Hey guys having an issue after I flash my pcm the truck wont start It fires then shuts off then after I play with it for awhile it will start. it happend to me at the track last night I pushed it on to the trailer left it over night then it fired right up. Truck is a 2004 silverado 07 van pcm swapped to DBC added wiring trans is a FMRVB 4l80e none lock up when the truck is running its fine and only happens when I flash the pcm.

 

Try disconnecting the battery for a few seconds after you flash a tune. That helps on some cars.

 

Yea tried that didn't help thank you though