To the above, It's a breeze, it doesn't have an ECU for readings.. Well it DOES have an ECU but it's not the same as an EFi car.

Another thing, Breeze's didn't come out with RPM gauges.

There is a small Idle screw near the carb which can be adjusted to raise the the RPM Idle. Try that before anything else.

Carbs have low pressure mechanical pumps so it could be a possibility of it playing up and not delivering fuel, but that would be through the whole rang, not only on deceleration. I'll write up a bit more info later.