??? ???Can anyone help? Some of my aircraft oscillate wildly up and down in flight when i let go of the stick or when i engage the autopilot. not all my aircraft are affected. ???

Yep. Trim is mucho importante in most planes. In reality, pilots trim, or at least get the airplane in the right position, before invoking the autopilot. Make sure you are trimmed before takeoff. Some planes do this more than others. My G-V I downloaded is FAR to sensitive in pitch, period. I just barely touch the stick and it will bob around like there is no tommorow.

Yep but for some editing challenged people, the only solution is download another airplane. Any respectable aircraft maker will take the time to adjust it properly.

Well in indicated airspeed a 737 shouldn't be going that fast, but that's another story. Ok, at 16x that is common buddy. At 1X, which most people cruise at, you notice the plane oscilate slowly up to 100 feet sometimes. It isn't really noticable, unless you are going 16 times that and then those little oscillations look much bigger and more obvious. This is somewhat true to life, many autopilots will veer from altitude up to a hundred feet either way to maintain speed without moving the throttles.