Actually, im not sure if this is a bug or a "feature" of the new CT modelling.
Before ver. 2.07
When hitting autoclimb at fast speeds (above 200) the HMk1 would climb steeply and then, when entering sustained climb - because its done too fast - the engine would cut out due to neg G, plane dives a bit until engine restarts and plane entered normal climb. Annoying, but if you knew/remembered, no problem.
Now, with the new patch, the pulling of negative G forces (via autoclimb) and the following eng cutouts happen at much lower speeds already. It goes to the point that, after initial steep climb, and eng cutting upon entering normal climb, the HMk1 will pick up speed in the following dive, speed which now is enough to make eng cut out AGAIN. Only sure fire way to enter autoclimb (without any eng trouble) now is slow down to approximatly 120mph (sustained climb speed) before pressing ALT X.
Now, i realize the Mk1 isnt top priority, but it would be great if that could be changed again (if that is possible at all).