I have a 2011 F250 diesel and it keeps stalling and intermittently "missing". When I come to a stop, the RPMs will drop and then return to normal, and then drop again and stall. Then it takes about 5 to 10 tries to get it finally started. I replaced the crankshaft position sensor and it worked for about 20 miles, then the problem started again. It finally died, and I couldn't get it started. As a side note, there was a fuel system failure and I had the entire fuel system replaced, but I don't think the two are related.