1987 ford E350 460 7.5L backfires
acquired a 87' E350 econoline w/ 460 7.5L EFI cab over motorhome. this thing sat for some time owner told me "the fuel pump needed to be replaced, parts are there" replaced parts given (fuel pump, ...
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Check fuel pressure on the fuel rail test port, also could have problem with the mass air flow sensor between the throttle plate and the air box, and scan it to see if you have any codes stored could help as well, if you need the fuel pressure specs i can look them up.. one other thing to check is the fuel pressure regulator , could try and pinch off the return line to see if that helps too
