In trying to locate the problem, I did a little testing. Both hand flying and with the autopilot on I was able to duplicate the same problem. As soon as I went full flaps, the airplane did a nose dive but did not lose altitude at a rapid pace (only 500-800 fpm).
I don't believe this is a problem with not being used to the aircraft. However, I still have a few more troubleshooting ideas. I will post periodically throughout the week with my testing and see if we can pinpoint a problem. For all I know it is just FSX being FSX.
Thanks for the replies so far.
Matt M.
WWA 1887
AHM KDEN