QUOTE(phantom914 @ Sep 10 2004, 09:05 PM)
Umm... how would the CHT cause anything different to happen to cylinders 2 and 3?

Shouldn't the ECU lean or richen the same for all cylinders based on the CHT?
that's what i would think.
i'd replace the FI trigger points, rotor, cap, plug wires, and double check all wiring.