Paul
I tried a check valve connected  to the vacuum port on the top of the 2"
intake between the slide throttle and engine.
The a/c is at Martinsburg, WV. I live in Northern Va.
I have taken the slide throttle off and am now trying a throttle body
but here is some info that I have from prior testiing:
vacuum went from an unsteady 10"-5" from 3000-4600 rpm. below 3000 the
engine chugged and sputtered and vacuum went to 5". EGT was 1600 at each
rotor at wot 4600 rpm and below 3000 rpm the EGT would show #1 at 1400
and #2 not registering. Then sometimes it would reverse with #2 at1400
and #1 not registering with the engine shaking.
I run unleaded fuel. The fuel/air gage can be brought to stoichiometric
above 3000 by use of the ECU mixture control but below that it is very
temperomental and will swing back and forth with the engine surges.
The crank angle sebser is stock.
I used another crank angle senser temporarily on the engine w/ the ECU
on and engine wiring and twirlled it by hand to check the spark and then
the injectors with coils disconnected. All plugs fired and all injectors
spurted fuel.
I tried running the engine with a vacuum pump connected to the vacuum
lines to simulate idle 13-15" hg but could not get it to idle steady.
I'll be going back out tomorrow to MRB and will take pictures. President
visit today.
John Prendergast

Are all the vacuum readings mentioned above in inches of Hg pressure?
What sort of vacuum gage are you using?
Do you have a prop on this engine?
Where did you get the slide throttle?

Paul Lamar ...No rotor no motor.

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