dustomcc

Good Morning, having an issue with 2011 F150 Ecoboost Lariat 90,000 miles. (NOV 2018) pulling out of driveway stepped on the accelerator it started to go and then felt it "slip out of gear" tac on speedometer dropped RPMS shot up and i didn't go anywhere ,stepped on gas rpms went up but again didn't go anywhere. put it into park shut it down restarted and still same thing. thought i was transmission so i had it towed to dealership and they added 2 quarts to transmission fluids found no leaks no codes, updated the computer and i have been good for a month. (Jan 19)yesterday i pulled out of work and i accelerated and let off the the pedal and it accelerated like i hit the cruise control.. (i didn't) i hit the brake and again tac on speedometer dropped and rpms shot up. i pulled over and restarted... drives fine. there is a pattern but unable to duplicate. has happened just these two times. thoughts? thanks for taking the time to read this.