I have a 2001 Ford F150 and when I accelerate it bucks, hesitates, and sputters, but when i let off the accelerater it quits, feels like it is not getting enought fuel. No Engine Light comes on. Had my fuel pump and and filter replace about 2 months ago. Also, just replace Idle Control Valve and cleaned out Throttle Body, MAF sensor, but not luck!!

SOURCE: My 2003 Ford Focus ZX5 check engine light came on.

Have you hooked this up to an OBD11 reader yet ?
May be a bad crank, cam or knock sensor. Cars today are loaded with sensors.
If you don't read the codes you will be chasing the rabbit down the hole. ;-)
Hope this helps
Sam

SOURCE: hesitates

If its Carberated Its the Exelerator Pump in the Carb if throttle Body Injector is Mis-Pulsing or Dirty

SOURCE: 1996 Ford Taurus power hesitation

If you disconnected the Mass air flow sensor the car should have die out at idle. Check fuel pump pressure at the fuel rail should be 30 psi at idle. Low fuel pressure will cause your po 171, 172, problems which could cause the other to problems. You might be needing a fuel pump and filter.

SOURCE: P0171 code on 99 Ford Escort ZX2 2.0L

Check vacuum hoses to MAP sensor. They can get porous after a while. Also check hose to EGR valve.

SOURCE: At high RPM engine sputters like it's flooding.

check your fuel pump and filter,filter may be dirty ,fuel pump may not be pushing anough presser,or your pressure ragulator my be leaking