Very easy fix to a very important issue.

Truck began stalling when decelerating to turn, (usually right-hand turns). As the problems grew worse/more frequent, truck would stall after refueling and stall at idle unless I gave it a lot of gas and got the engine running at higher RPMs (burning additional gas).

After a ton of research and a near-collision with another vehicle, I gave replacing the evap canister fuel valve a try. Only a single user on some other forum mentioned this, but he seemed extremely certain about it. He said Ford had gone with a cheaper valve on the 09-10 models and it was failing repeatedly. The valve would stick open causing the engine to get flooded with gas (run rich). I ordered here:

http://www.partsgeek.com/gbproducts/DC/30322-05249495.html?utm_content=DN&utm_term=2009-2010+Ford+F150+Purge+Valve+Motorcraft+CX-2448+09-10+Ford+Purge+Valve&fp=pp&gbm=a&utm_source=google&utm_medium=ff&utm_campaign=PartsGeek+Google+Base&gclid=CImS94T7yccCFVUbgQod-SoGiw

Make sure you order the right one for your model. Mine was a Motorcraft OEM I think. Now is replacing a part that fails with the identical part a good idea? Short-term, definitely.

Replacing was easy once you have the part. The part is located right up against the firewall that separates the engine compartment from the interior of the vehicle. Just right of center. You will have to reach over the engine block to get to it. I need a two-step stool.

Unplug the electric plug that powers the bad unit and lay it aside. There are two clips on either end that hold the part in place. One green and one gray notice how the bad part is installed (note which end is which). Each clip has an open spot on one side. You will push the pointed part of the clip towards the tube it surround to "unclip" the part. Once both ends are unclipped, you are ready to remove the bad part. To install the new part, simply reverse the process. I am bad with mechanics but this was a simple fix. I was quoted $400 by a mechanic so if this posts helps, feel free to send me some of your savings.

I have not had a stall since!!!

Ford , fix or repair daily. I have a fuel issue where I stop to fill up ant the truck will not want to stay running, you have to keep pumping the gas pedal and slap it in gear and go. This has happen three times. About six months ago my truck will not hold a full tank of gas. It will only hold about 23 gallons of gas. The needle will show full but after 15 min of driving it will go from full to 3/4 of a tank. I have spoken to some mechanic and they all ask does that truck have a fuel cap and I do not have one. This two of five more issue I have. This the worst truck I have ever owned. Wast of money

Update from May 29, 2014: My truck also had a 1/4 tank of gas when I was driving for about five min then my fuel light came on and as I was pulling in a gas station the motor shut off and I just stopped in time before I crashed into the polls that keeps you from crashing into the pump. The day before this happen was one of three times that I filled up and the truck would not stay running, I got the truck to the dealer for the second time and took a video of the truck sputtering like it was having a problem getting fuel, showed it to dealer they had no fix or cause even after my truck spent two days in the shop,