perhaps it needs some antibiotics?

took the injectors out today to check seals but all looks perfect no sign of combustion leakage and seals are soft.before i took them out i tried dissconecting each wiring plug in turn to see if it would start on 3 cyls but no luck.
strange thing is when you first crank engine it fires almost like it is going to start then nothing.is there any way of measuring "rail" pressure on these engines?

thanks.