How does ap for Beechcraft Kingair B350i works?

I have problems with nav and speed. I cant use both. No matter what i try or switch i always have to correct course manually since nav dont work the way i planned the flight before. With the A319 e.g. its no problem since i can switch between nav and hdg.
The next problem is the speed. I can choose a speed (for some reasons i cant choose it all the time) but the ap will never control the throttle which compared to A319 is no problem usually.
I tried all that is possible and logically but could not control this ap. Is it buggy btw?

The King Air does not have auto throttle, if that’s what you were expecting. You must control speed with manual throttle.

It will pitch for speed if you are in flight level change mode, but that is not auto throttle.

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And maybe for the nav to follow your flight plan you have to select the gps as navigation source with the CDI button.

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