trying to figure out the "ata" gauge

[Rattlehead]

Phew...this is heavy reading, but invaluable. Thank you very much.

I and others new to CEM are continually frustrated by CEM in this sim and the board is crying out for a CEM thread.

Quick question: I have a constant shaking/shuddering effect in my 109, despite trying different ATA and RPM combinations and also playing around a lot with the 109's variable pitch propeller.

The only way I can seem to eliminate the shuddering in the plane is to run it at full ATA constantly, but surely this isn't good.
The minute I decrease throttle the shuddering returns, and sometimes it gets so bad it's difficult to concentrate on flying. All my temps are within safe zones, so it's not temprature related.

(And yes, my undercarriage is raised. )