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Q:

what causes code 212 on 1993 Ford F-350

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
misfire and quitting during acceleration when warm
(2) Answers
Code 212 = Loss of IDM (Ignition Diagnostic Monitor) input to EEC or SPOUT circuit grounded.... 1. Check for the short to ground possibility in the SPOUT wire (to ECM side and to ICM side)

2. IDM wire from Ignition Control Module (ICM) to ECM integrity (open, short to ground or power).

3. Was ICM already replaced

4. If all the above checks OK......the ECM will be the one to blame.