make sure that the injector plugs are on the right way, i got them mixed up as mine were not labeled when i did my conversion. they do not go as you would logically think!
because of this i had the same problem.
the order it should be is: (starting cambelt side)
injector 1 : black / brown + brown wire
injector 2: red / brown + brown wire
inector 3: green / brown + brown wire
injector 4: yellow / brown + brown wire
BUT the idle control valve and injector plugs DO fit each other. i had injector 1 on 2, 2 on 3, 3 on 4 and 4 on idle control valve on idel control valve on injector one. the car did run at first but missfired like hell and wouldnt idle.....
got this confused as the wire for injector 4 is a lot longer that it should be it is just meant to sit inside the plastic case but i took that off when i rebuilt then engine. hope this helps mate