I'm needing a stock pcm for my truck prefer 4.8 and for a 5 speed i'm just trying to eliminate some issues wrong with my truck. Tuner wants to argue that the pcm is not the issue when everything else works just fine its loosing ground from the pcm to the starter relay causing the truck not to start.

 

Before buying a pcm there is a ground on the back of the passenger cylinder head grab the wire and tug on it to verify it has not broke. I have had several trucks in the shop break this ground and have the same symptoms as your are describing.