have you tried a heavy gauge feed to the fuel pump, the std wiring and connectors may be causing volt drop along the length and causing teh fuel pump to give poor delivery flow/pressure...?

other thing that isnt on the list.... is the fusebox. have u had the battery off and checked the 3 seperate feeds to the fusebox, mine had all melted and coroded

other thing is that it could be an bad earth from the ecu to the inlet manifold.

1 more thing , have u popped open the rubber boots that go on the coil, thse can corrode a lot in side and so cause low voltgae to the coil....