06 Envoy Denali P0351-P0358 Codes

[Jcp0575]

I just bought this Denali today. Had low Oil pressure when I got home, cleaned oils switch filter, works great now. Took it for a ride, came home and went to start an hour later. Now it will only crank, won't start at all. engine light is on and all P-0351- P0358 codes are showing on my scanner, I cleared them, cranked till the battery went dead ( Numerous Tries) and they came back. What could this be? I checked wires and fuses, everything looks OK. Please help.

 

[Jcp0575]

Update- fixed

After 3 days at the dealer and the most high tech tools! I solved the problem by searching the Internet for 3 days. There had to be a common problem for all (8) ignition coils to have a fault. The Ground Wire. It's G109 and bolts to the front of the engine on the passenger side, next to the A/C sensor. It was loose, just barely loose. I tightened it and the truck fired right up. Just had to clear all the codes after I drove it home. I fixed it in front of the tech at the dealership and they waived the diagnostic fee.