Chevy 4X4 pu

1987 PU Chevrolet v10 4x4 5.7 350 bowl F.I.

The truck idles rough with white exhaust. When revved while in neutral it is rough coming up in rpms and sometimes never fully reaches max rpm. When put into drive and start to accelerate it acts like it is flooding itself and bogs down. You have to continually pump the accelerator to get the truck to move. The truck never comes up to speed. It also drains the battery at the sametime. It is as if whatever is causing the problem is drawing too much amps.

I have replaced the O2 sensor. It sounds like maybe the fuel pump is malfunctioning?

Thank you for your help.