Have you checked the CPS has the correct resistance?

Have you removed it and checked it by eye for any type of abnormal wear or marks etc.?

When cranking does the CPS pickup a signal on a multimeter?

Yes/No.

If yes, do the injectors get a signal to open (To check this use a Mk5 escort sidelightbulb pluged into the injector plug)

What type of trigger are you using, i.e FRST crank and CPS in the block~?

Loads more questions but need to know the above first.

Regards
Jano