Strange, sounds like a bad plug or coil to me. Has it done it since new?I have a 2014 (Dec/14 purchase) F150 Ecoboost, 2600 miles. Having an engine miss and surge on cold engine idle; dealer replaced low-pressure fuel pump in the gas tank, which did not fix the problem. Now, additionally, I have engine surging (strong/weak/strong, etc.) cycling on warm engine acceleration -- it is causing poorly timed shifting. Not an operational problem, but I know it's not right. Dealer says, "Huh! I can't feel it, you need to put more miles on it."