Automatic Transmission problems of the 2008 Mercury Sable

Automatic transmission - when the vehicle is in drive and stopped on a hill the car will roll back when you remove your foot from the break even when in drive. This is an ongoing issue. You need to use both feet when on a hill, one on the brake and the other on the gas to avoid rolling back into another car. When the local dealer was in business they indicated this was normal. At this time I have no local Mercury dealer to review this situation.

1. Trans fails to downshift,intermittently, when accelerating from appr. 50 mph on and incline, revs to 5500 rpm but car slows down. Almost got hit by truck on freeway yesterday. 2. The car ground to a halt while making a left hand turn and accelerating at about 15-20 mph. Occurred one time, almost rear ended. 3. On slight incline, in drive, car will roll back as if in neutral, almost hit car behind me several times and difficult to park vehicle. There are other trans related issues, but these three are safety concerns. Car has been at dealer several times, for days, they test drove it, had an engineer from Ford drive it, state unable to duplicate any of my concerns. In other words, nothing was done to correct the problems. These problems continue to be easy for me to re produce, along with other problems, shifting late and hard, etc. . I have called the regional service person abe bush, twice in the last 3 1/2 weeks, and received no reply from him.