R33 2 killa

Recently done a plus t conversion and now car won’t start have checked timing have replaced coils and plugs is getting spark . Fuel pump primes and getting fuel into cylinders have tried starting with the chipped ecu and stock de ecu still nothing car sounds like it wants to fire but it’s just not getting there afm doesn’t seem to be the issue either. Anybody have any ideas

Did you ever sort the issue just done a plus t and it’s doing the same