Replacing O2 Sensor & Ignition Module - '93 Chevy K3500 454

Continuing my quest to figure out what is wrong with this truck. I tried disconnecting the EGR valve to see if any change. But, the problem just so happen to start after connecting a couple wires, though I don't think it's related, so I disconnect those to see if there is any change. I try turning the truck off and back on and make a small breakthrough, the truck runs fine for a short time after turning it off... I remove a stuck O2 sensor and replace an old crusty ignition module
for a '93 Chevy K3500 454. Visit from sneakers the inspector kitty.

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