This old beat up '99 Ford F250 is suffering from a very rough, surging idle, as well as hard starting in cool damp weather.

No DTCs are stored so we have to use our heads to pick a direction and come up with a hypothesis.

Part 1 includes:
quick scan of the trouble codes
OBDII Mode 6 Misfire data
ignition coil current ramps using scome and amp probe at the fuse box.

See if you can guess the problem with this truck before I post the FINAL FIX!