recently i replaced the worn out 302 efi motor in my 1986 f150 4x4 truck with a rebuilt motor and i had the aoe rebuilt as well. in park neutral the motor revs till about 3800-4000 rpm then cuts out in gear under load it studders at about 2000 then cuts out completley at 2500ish i have replaced the plugs wires cap rotor fuel filter and the inlinw fuel pump(problem happens in both tanks) also i have checked the cats/exhaust for plugs and installed a jacobs ignition and coil so far nothing has helped i plan on getting a code reader in the next few days but my check engon lite is not on any sugestions on were to look in the meantime would be much appreciated

 

I had rhe same exact issue with my issue with my truck there is a cartrige filter that is in the fuel tank switching valve assy. It is mounted on the frame rail in between the front fuel tank and the high speed pressure pump. Untwist the bottom of it and a filter will be inther that is clogged. This took me about a month to figure out. Should be a 5 dollar fix. Good luck

 

As per my opinion there are a few possibilities,
How clean is the fuel tank? Is it possible that the screen on the fuel pick-up is getting plugged each time by loose particles in the tank drifting to it each time the pump is drawing fuel?
Is there a pressure or flow regulator that may have been added at some point that is either miss-set or is beginning to block?
How long has it been since the fuel filter(s) have been replaced?

 

tore the fuel tank selector valve apart last night filter has not been changed ever i dont think and both fuel supply valves were broke. thanx for the suggestion in looking here now i just have to find a new one