[scarceller]

If you increase the 3.2 to 3.4 liters you most likely increased air flow by about 6% and the stock injectors should be OK for a 6% increase in air flow. But if you increase Air Flow by more than 12-15% then those injectors may not have enough time to supply the fuel needed at higher RPMs, pulse width is simply to long.

I'd also expect about a 6% increase in HP and torque since Air Flow is directly related to Power. All things equal you can't create more power without more air, this means that the same tuning principles applied to the 3.2 should yield about 6% more power in the 3.4

I suspect something else is wrong with the setup if your AFRs are that lean. As already mentioned be 100% certain that the WOT switch is actually closing at WOT. The WOT switch does not click like the idle switch does. The WOT switch is a old school contact switch and you can actually open it up once removed from the car, once opened you can clean the contact points with 1200 grit sand paper. This switch is NOT sealed and is exposed to ambient air, then couple this with the fact that it's not often used on the street and the contact points easily corrode. I suggest you remove it from the ThrottleBody and inspect and clean it then reinstall it so it makes contact at about 85% throttle open. I've seen this switch cause real issues if the contacts are corroded because it causes the DME to bounce between Part Throttle and WOT maps.