Codes and check engine light

[Rawze]

All those codes point to a power/wiring problem with the emissions system. Those Cm871 engines have a main harness that connects the emissions system to the engine. It is likely a loose connection, corroded pins in the main plug, etc. -- Just a guess, not there to see what it is doing.

Under the truck from the canisters, you will find all the sensors go toward a main plug with about 8 pins or so. corrosion and water like to get into that plug and short things out. i would unplug it, inspect it for corrosion, and then clean it out with some contact cleaner and re-seat it. It could be as simple as that.

just guessing here, that may not be your problem.