problem started a few weeks ago. truck started bucking. also while sitting at traffic lights the rpms would go up and down from 500 to 2500 rpms. my brother who is a mechanic first tried cleaning throttle body and changed rotor and distributor cap. also replaced what he called a "IOC" valve..... none of this helped. next step was to changed the throttle positioning sensor.... ran truck over next few days and thought we had it. nope...yesterday on way home it started bucking hard. as i got off parkway and headed for a parking lot, the bucking got more consistent, losing power like she was going to die. had a 1/4 tank of gas. shutdown truck for about 15 minutes. restarted and started driving home which was 3 miles away. ran good for first 2 miles but then it started bucking again and i barely made it home. brother now thinks fuel pump may be crapping out. (this same thing hppened years ago with my 04 ranger and it turned out to be the fuel pump failing intermittedly) today we put a fuel line pressure tester on it and we were between 30-32 at idle which is lowest acceptable point. ran it about 40 miles hoping she would start bucking but it never did. anything else we should check or am i looking at a fuel pump issue ???? tough fuel pump to find. where can i look ??? many thanks in advance don