Vehicle Shudder problems of the 2007 Mercury Montego

I got my 2007 Mercury Montego premier from my mom, who I bought it from. At that time, there was only 52,000 miles on it. At 52,000 miles, whenever the car would be put in drive or reverse, it would lunge forward. Over the years, the problem has gotten worse and worse where now when putting green the car in drive or reverse, the car lunges forward to the point that I have no control of how far it will lunge. It's so bad that I worry that I might hit someone with my car just backing up. Now, at 130,000, the transmission appears to have gotten even worse where it is slipping in 2nd gear. You give the car gas and it seems to just be at a stand still, then a) of a sudden, the whole car just throws itself, and any passengers in the car, forward and just shakes the entire vehicle. I'm surprised I haven't gotten whiplash from it, but it's so intense when it slips gears and then gets back into gear, that I would compare it to someone being hit from behind at about 20 mph. . That's how rough it is. The NHTSA is aware of this issue. They state that thee aren't enough complaints, but I know that not to be true. If they pent some time going online a huge number of owners of this vehicle have complained bouton this issue, but nothings been done. To me, it seems like the money they must get from companies lie Ford is more like high money and he safety of the drivers and the people on the road comessage second to this very serious and very possible dangerous matter.