hi mate
i have a feeling (not totally sure) that when pats cuts in the fuel pump etc won't work either have you checked the coil pack there are 3 connecters on there the middle one should be 12volts all the time with ign on, it then sends a signal to either side and fires 2 plugs at once.
i did have it once where the plug connectors had spayed out so i lost one side of the signal and wouldn't fire...