I have a 2006 F150 2WD and Im having a issue with IDLE and Fuel Problems.
It idles to high when I intially start my truck and I have to keep my foot on the brake to put it in drive or reverse, I have service the transmission and someone told me it could be the mass air flow sensor.

I get bad fuel miliage and even on long trips, havent service the fuel system.
Can anyone point me in the right direction, thanks

 

Check the fuel module on frame under spare tire they corrode and water gets in .

 

It sounds to me like a vacuum leak. The more air that gets in the intake the more fuel it's going to need to maintain the A/F ratio. Ford did have a recall on a brake booster vacuum hose back in 08 or 09.

 

In addition to checking for a vacuum leak... Using the proper cleaners, try cleaning the throttle body and mass air flow sensor.