Ford dealer cannot find the problem. At random speeds, generally around 25, 40, 70 truck lurches/bucks forward. This will continue to happen unless gas pedal is pushed way down, then it will stop for a while, only to start again. Has anyone found the answer to this yet?

Also, engine randomly cuts off and then back on when I make Left hand turns. The check engine light is on through all of this but no code for either problem comes up.

 

I have same truck 5.4 and am having similar trouble Id call it more a misfire what I found during a resent plug change was a plug pocket full of coolant. This was causing the coil to ground out it wasnt tripping any codes or showing on any scan tool. Sucked out water and cleaned pocket and drove after tune up cheaked pocket next day and found coolant coming in from top of hole know im trying to learn more about strange leak no sighns of a cracked head. So long story short check vyour plugs and coills for coolant.