Only half of the coils are working

What is your question?

5.3 engine, automatic transmission, has dod, afm, acts as if it is stuck in 4cyl mode, runs rough, stalls when put in reverse, had low oil pressure, replaced o ring on pickup tube solved low oil pressure problem, was running well, then all of a sudden, started running rough, does not have collapsed lifters, making no tapping or clicking or knocking noises, looks like an electrical problem to me, i replaced the valley pan with solenoids, no change, checked injectors all good, when checking the coils i noticed that i could unplug 4 of them with no change in the way the engine was running. The 4 that are unplugged are the 4 that are turned off when in 4 cyl mode or deactivation mode. So i checked the fuel injectors to the 4 cyls not firing and found that only those injectors were also not working. So engine is stuck in 4 cyl mode. What would cause this? I checked the grounds, fuses, vacuum leaks, shorted wiring, found nothing. Seems to be electrical. Any advice would be a great help

What makes this problem better or worse?

No changes after driving a few miles

How long has your 2008 Chevrolet Tahoe had this problem?

It started a week after a trip to Florida. Has been parked since then.