Toyota FJ60 Problem

I have a 1983 Toyota FJ60 and when I go up a hill or somtimes on flat ground the truck shakes and loses power and somtimes turns off ive changed the fuel pump and filter 5 times! the carburator is new. the carburator kit is new ive cleend the tank 2 times. the fuel goes in the carburator because i can see it in the filter. In the looking glass on the carburator the fuel does not reach the middle of the looking glass. ive cleend the gas lines 2 times. what is going on.