>>When the
engine goes over 1330 rpm with a closed throttle the injectors are
turned off. When the engine goes below 13300 rpm, the injectors turn
back on with the O@ sensor disabled for 30 crank revolutions. If the
mixture is rich enough during this bypass to bring the engine over 1300
RPM, we start the idle surge again.<<<

I've seen this surge happen with my digitool, the rich 02 and the injectors
shutting off. I've messed with the AFM spring to pretty much cure it. But
mine I had to loosen the spring and richen the open loop mixture to get rid
of the surge. I know it sounds backwards to me too. If I lean it back to
where the factory says it's supposed to be, I get the surge sometimes, plus
I get a bad just-off-idle flat spot.

Interesting info, where did you get the 30 crank revolutions information?

Mark Ingalls
85 GL

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