got 91 f150 4.9 clutch kit was installed now it fouls out plugs as if flooding changed most every thing i could think of and cleaned injectors with clean plugs runs great but only for mile or so first ford i've had in yrs so sorta new to this would be grateful for any suggestions even if i've already tried them

 

Have you attempted to pull codes? Were the O2 sensors plugged back in?

 

Check yer fuel pressure. Sounds stupid but check the air filter. Could be a plugged cat too.

 

new o2 sensor and do be plugged in fuel pressure checks textbook perfect even got new fuel pressure regulator and parts in distributor only thing not new when i got it is dist cap but seems like skip would be from start not mile or so down the road