| throughout the harness. Maybe try crimping the terminals on the connectors for the PTU to ensure there is contact. If the firing order was correct previously, I would rule that out..... try this and come back with results. Pull the problem coil out and try testing it with an extra spark plug you have lying around as I said earlier. I recently had the EXACT same scenario on a friend's Z that you have, and simply disconnecting and reconnecting the harness to the PTU created contact causing it to fire on all 6 again.
*disclaimer*: all that I say may be true or I may be completely wrong and I accept that.... please, it is your duty as another person on the internet to impolitely tell me how wrong I am :) "The dreaded 2nd windshiled wiper swipe when you turn it off its almost like tis showing you that it's boss, and it doesn't have to stop when you tell it to :("-College Boy (discussion on ptu relocation) "No good reason to put it there anyway. -Bernie (NoVA) False -vorpalZ False. -Bernie (NoVA) You're correct, there are 3 good reasons -vorpalZ False. -Bernie (NoVA) Wow, right again, just remembered another, make that 4 -vorpalZ" XD 
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