Thanks Marc & Joel. All comments taken on board.
Marc, the last time it was running (before timing belt), there were no problems. So i'd have to think that the injectors are fine. FYI, they are 550cc RX7 ones and have been tested and only been in the car about a month.
Joel, i was maybe thinking the ignitor module myself. As you know, you have to take the module off to get to the coilpacks, so in doing this the associated wiring to the module was moved around as well. I notice that the wiring is a bit stiff...prolly from years of heat. I'll pass this info on to him.
Regards,
Scott