My truck is stumbling (not an A-Body)

HAd a recent tune up? Fuel filter, plugs, cap, wires etc... if you cant remember the last time they were replaced, you need new ones. Clean the IAC and throttle body as well. I'd also do a fuel pressure check first to rule out a bad pump.

Then if I was gonna start throwing parts at it. Oxygen sensor, MAP sensor then TPS in that order.

Sounds like an intermittent problem. Should become obvious as it gets worse. Odd you are getting a CEL but no code history.