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p.s. you will find this useful. https://dl.dropboxusercontent.com/u/8316230/download_pdf/Wiring-Supp.3S-GTE_3S-GE_5S-FE_ST185RC.pdf p106/107 - fuel pump p108 - ignite & coil. (Earths aren't shown but are vital) p9 efi fuse location (to clear error codes) p35 - location of coil & igniter. (Looks like they are not on same bracket on the gen 5) I would guess the problem is more likely with the igniter than the coil.

Check the Earths on the igniter and coil. It may be a single assembly on a bracket with a wire connecting the two from memory. Particularly check the threads on the mounting bolts and tapped holes on the bulkhead aren't rusty. Clear the fault codes by resetting the ECU as per the link above and see what comes back. Only the GT4 variants have the dual speed fuel pump, the GE engine just has the 'circuit opening relay' which is on a bracket on the side of the ECU.

14- Igniter/ECU Possible circuit fault from igniter to ECU. May just be a poor connection. Unplug and push back in a few times on igniter and ECU connections. Possible faulty igniter module, but the car runs normally for a good while? Always worth removing the module and coil including the brackets, cleaning the mounting areas and refitting to ensure a good earth. I'm sure there will be other suggestions for you to check. Hope you sort it soon