1998 Dodge Ram Engine will not start

(5.9L fuel injected all original) Truck was running fine throughout a 450 mile road trip. Truck was shut off for less than 5 minutes at my destination and upon attempting to restart, it ran extremely rough (as if only 2 or 3 cylinders were firing) and would not rev above ~600rpm. Any press on the accelerator killed the engine. The check engine light came on and my code reader showed the #2 oxygen sensor failed with high voltage. That was the only error code generated.

After the truck sat overnight, when cranked it would just turn over normally without any sign of starting. So, new oxygen sensors were bought and installed, figuring that 185,000 miles was about time to go ahead and replace both of them. This did not solve the problem, as the engine just spins over (sounds normal) but there is no attempt to fire off.

This truck had 1 prior event of failing to start about 5 years ago. During that ordeal, no code reader was available and both the cam and crank position sensors were blindly replaced. The problem was the cam position sensor. The distributor cap & rotor were replaced during routine maintenance shortly afterward. IIRC, that all happened somwhere around 90-100K miles. The platnum plugs have been in since about 50K miles.

Wondering if it is possible that a failing O2 sensor caused an over-rich condition which may have fouled all 8 of the old plugs or if there may be something more sinister going on. Repair resources are extremely limited at my current location (there's 1 NAPA store) in a one-mechanic town.