"Peter Clark" wrote in message
...

Sounds like the AP computer. Did the code download come up with any
codes? The shop did hook a laptop up to the KAP140, right?

There is no connection between the G1000 and the KAP140 outside of the
GPSS and HDG outputs. Altitude modes are all internal to the KAP140
which is why it's got a static input and you need to enter the
altitude (again) and baro (again) when making changes. Is there a
blockage in the static line heading towards the KAP140? Any other
wierd readings on the primary or secondary instruments?

The King A/P's, after the KFC200, have had probems with the computers.
http://avionicswest.com/articles/kno..._autopilot.htm