Do you have SES?
What are the scanner codes (all)?
New wires and plugs?
If yes, what "P" codes (from above) are you getting?
Check the coresponding Ignition coil.
Turns out, we have 3 coils each sparking 2 cylinder plugs (always the same 2).
COIL-POSITION CYL-POSITION
(Closest to the windshield)
TOP: 6, 3
MIDDLE: 2, 5
BOTTOM: 4, 1
(Closest to the radiator)