its always the last thing you try...

You could try testing it although from the problem you are having it sounds like the fault wont be detectable on cranking.

Hopefully you can get a spare one cheap?

Ive got loads of EFI spares been stripping all the cars at the local scrappy ready for the conversion. Never have too many spares I'd say it was electrical too cant be a lot else? If the problem persists i wouldnt overlook the injectors either?

let me know how you get on