About 1 month ago i asked a question about my '77 e350 motorhome. since then i found one asked by kprince65 on 8-16-11 mostly describing my problem. i bought the rv in '06 in illinois, problem arose about 500 mi. from where i bought it. rv has fresh rebuild (came w/1yr warranty card) new electric in line fuel pump (not in tank) and new coil. not sure about block yr. has un-machined boss for mechanical fuel pump. after market pump rated 4 lbs. psi. last time i moved rv, problem got worse. 35 mph at best, had to drive w/dog house off spraying ether in carb at stops. what's wrong w/this thing? any help much appreciated.