1994 mustang GT sputtering

So code 111 is system pass.

Code 212 is "Ignition TACH signal was erratic (module/wiring) or SPOUT circuit fault – Ignition Systems". That code alone will not cause drivability issues, but could indicate an issue with the TFI module/ignition system. I'd have the TFI module tested and then start looking at the ignition system (PIP sensor in distributor is notorious for failing) if that tests fine.