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Took my truck into the Blue Oval dealer. F250 PSD had been stopping, missing for several weeks. Several days between episodes, then several each day on drive to work ( 10 miles each way).
Dealer had truck for 3 days. Backed up in deisel shop with 2003, 04, 05's with major engine problems.
Called me to let me know it was a Cam Position Sensor, and my cost was $100 .