Was your PCM flashed to remove the VATS? Seems like VATS is cutting out the fuel injectors. It might be something else minor too. Don't overlook anything. When you're this close, check for the things that are obvious and not-so-obvious.
Not sure if PCM is supposed to be that loud. I can't tell if mine's that loud since it's mounted under the hood. I've never heard it but I will listen for it in the future to see if it makes any noise.
'93 Chevy 1500 4X4 ECLB with a '99 Silverado LQ4 6.0 and '99 Escalade 4L60E. SOLD IT!!
New toy: 2001 2500 HD 4X4 Extended Cab Long Bed
John