P3D V 4.4     Since release  of 757 in december and 3 times new install I try to find the correct way to make a descent using VNAV and autoland.

I have tried several different airports and distances altitudes.

Studied the manuales and looking at many good ideas in forum and YOUTUBE, but I allways end up with a diving aircraft and very high speed.

All relevant data in the FMC  but I do something wrong.

Climb OK  and CRZ OK.  Before T/D I set altitude to ZERO (also tried fx. 2000.  When FMC in page VNAV reach T/D the aircraft descent maybe VS 4000  and accel..
OK I can use FLC and back to VNAV and control speed manual-


I used the 777 in earlier version P3D and had no problems.
I also use the AIRBUS PRO - and are aware that I cannt compare the two aircrafts behavior.


Hope someone can give an idea.