Hi,
I assume you have a normal 2002 that someone updated to the dual carb setup, so little guidance as its not a stock setup. If you really are experiencing a rev limiter in operation (not something else), it would have to come from the ignition system. Check the rotor in the distributor, that the correct rotor is installed. There is a rotor with a built-in rev limiter, would be nonsense even if it fit in the 123 distributor. The programmable 123 has a software activated rev limiter, which can be set to whatever RPM required. Check these two points.
Andrew