I have experienced this twice now in my stock 2010 Fx4 built 12/09. From highway speeds I let off and coast or lightly brake. I needed to merge quickly so I floor the gas pedal. Nothing happens I just coast for 3-5 seconds. Then the trans bangs into third and accelerates normally. Anyone had or fixed this?

 

This is exactly what I have complained about. Mine did the same thing. It was built in November 2009. To me it was totally unacceptable for driving where I do, which is DFW like you. This is one reason I no longer own it. It is downright dangerous and one shouldn't have to buy a tuner or got to the dealer a million times to complain about the tranny to get a new vehicle right. Good luck with yours.

 

My dad's '10 does the same thing. It takes an honest 3 seconds to start pulling. There is no way that it's normal or should be taking that long, it's a danger for a lot of driving situations.

 

Not sure if this will help, but check out this thread...

https://www.f150online.com/forums/v8...ine-works.html

Seems that most vehicles can be calibrated this way now.

 

Sounds like the same thing that was happening with mine:

https://www.f150online.com/forums/20...mph-clunk.html

I ended up bringing it to the dealer, told them what was happening...their tech drove it and verified the problem. I believe they said they loaded a new strategy or something along those lines, regardless of how they worded it...it solved the problem 100%.