My 88 Bronco, 4.9L MFI, has a severe hesitation/sputter problem....when accelerating, anything past feathered just off the throttle stop, the engine cuts-out, hesitates/sputters severely....so far ive changed plugs, wires, cap/rotor, fuel filter....cant find the problem...runs fine at idle, starts fine....whats next?...head to the shop for diagnostics?...are those hand-held diagnostic computers worth the money?....HELP PLEASE!
