Power loss in Couer 2001

Hello greetings for T2.
Well my problem is the following I have a 2001 Ford Couer pickup and the fact is that after some time the pickup is on the stops, do not go out but if you step on the accelerator no longer respond, I turn it off and I turn it on and walk well for another time but then you start making the same failure, I already changed the gasoline pump and the empty valve of the gas tank mention that the injectors also wash,
if they could give me any tip or advice on my fault, I will appreciate
salu2 from mex
ppon