Please help...autopilot acting strange..

hey guys, ive posted on fsdeveloper and other forums to no avail..hoping someone here can at least point me in the right direction. trying to figure out the autopilot on the GAS Super Stearman. when engaged...the trim lever instantly goes to neutral and the airplane as a result just nose dives. ive tried different autopilots ion the system.cfg including from the default baron etc. the trim goes to zero and never moves..its like it doesnt even try to correct itself to hold altitude. ive tried using keyboard controls, and the PMS GTN 750. all works in other airplanes. ive even taken EVERYTHING ELSE out of the community folder thinking it was a conflict...what am i missing...i though the ONLY thing that affects autopilot is in the systems cfg...is there something else?