94 5.2L Magnum running rough

My '94 Ram did that. Coolant temp sensor (there are two) was reading 14 degrees when it was 70 out, at first startup. The closed-loop kept the symptoms at bay until it was warmed up, driven, and open-looped itself into drowning in fuel. (I think it used one coolant sensor for the closed loop, and one for open). It was dumping fuel because it thought it was cold.

It won't throw codes, and it will need new spark plugs if that's it. I had to use a Snap-on scan tool (Thanks, Chris!) to see what the sensor outputs were, exactly.

New sensor fixed the issues immediately.