ok i ave 1994 completly stock before i did any thing to it . i tour engine apart changed all gaskets and seals didnt mess with the timing at all.redid the head with 3angle valve job roller rocker magnum power this and that updated fuel system pumpp 255 and 42 # injectors .AND BIGGER MASS AIR OFF THE LIGHTING FORD car wont start it has spark and fuel my only guess could be that the computer aint reading the air fuel mixxer correctly because its all change do i need to get it tuned in order to start the damn thing hellllllppppppppppppppp mmmmmeeeeee mike ty