What’s up everyone really need some help here. Got an 08 that I recently put an engine in. The afm went to crap and damaged the head in the process. Bought an engine from Cousineaus Auto Parts out of Wisconsin and it’s having an issue starting. Brand new starter, battery but the alternator is the original one from the truck. Got all three tested and they’re fine. The truck will start but once shut off it struggles to start again. Tried swapping batteries and that didn’t help. Took the terminals off the battery and hooked jumper cables and a jump pack straight to em and still nothing. Exchanged batteries again (same 800 cca) I was previously using and the truck fired right up no problem at all. Drove it 10mins and parked it and now it won’t start again. Really at a loss as I’ve determined it’s not a battery issue. Please help…