Have a 1978 Sierra with an STEC 50 autopilot and a
Garmin 430. When I put the autopilot on heading mode,
she will rock back and forth like we are on the ocean.
If I set the heading bug to 270, then she will go
from 260 to 280 and back again. It is usually pretty
gentle, but sometimes not - and after a while, it gets
annoying. When I have the autopilot on Nav mode, she
rarely has the same problem. My avionics person
cleaned out the autopilot gyros and put it back
together, but it still does the same thing. Any
thoughts?

Mark Stuckey
N5428M
Macon, Georgia
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