I have a 1995 F150 4X4 with a 5.0 Automatic. It runs fine sometimes but then
it will bog under part throttle, pop back and run crappy until wide open
throttle then it takes off and runs great. Always runs great at wide open
throttle. Occasionally it will stumble at an idle but most of the time it
idles perfect. It gives a lean code but as it is obd 1(stupid as I call it)
no data stream. Here is what I have done so far. A lot of this is as it is
my sons first truck and I just want it all ready as soon as he gets his
license in the next month.

New plugs, wires, cap, rotor & distributor
Changed computer - same exact symptoms as the original one
Fuel pressure test while driving on two tanks all is fine
New mass air
New fuel filter
New throttle position sensor
Cat is punched out
O2 sensor was replaced before I got it
Cleaned all grounds

It doesn't skip or run bad on any cylinder but just like something is not
telling the injectors to open all of the way until you hit wide open
throttle then it goes great.
It is worse up a hill but will do it on the flat also. The check engine
light will cycle on and off but only shows the lean bank 1 code. I am hoping
the different computer may come up with a new code.

Thanks in advance for all of your suggestions!