Dave Lemon owner of Mazdatrix discovered a strange phenomenon.
Apparently a Weber carb on the end of tuned p-port manifold
can enter a unstable condition where the mixture obviously
is changing rapidly from way too lean to way too rich.
The engine goes maximum rough and a ton of fuel air mist
eight feet high appears over the carb intakes. We are
not sure what causes this. It could be a mechanical resonant
condition of the carb intake system shaking the float bowl
or it could be something to do with rapidly reversing airflow
confusing the venturi sensor. It happens about the tuned
RPM or peak torque RPM. One can pass through it. It seems to
be a function of the jetting. This is a new one on me.

We will know more in a couple of days.

I was pleasantly surprised to find out the 2nd gen front cover
water pump and ignition distributor fits the RX8 engine with a change
to a 2nd gen drive gear on the nose of the RX8 e-shaft.
That makes for a very simple stand alone ignition system.