FYI (FICM information) to add on to CTCDeezul's post:
C1388B (X-2) Connector: Injector Control, Cyl. 2,3,5,8 (Middle plug)
C1388A (X-1) Connector: Injector Control, Cyl. 1,4,6,7 (end plug)
I believe that the spool valve actuating is temperature dependent (oil temp I believe).
Sounds like a...