Problems, Just Bought 2001 Deville
 

I won the auction on a 2001 Deville for $505 and there are a couple of problems with it only one major. When I go between 42 mph and 46 mph or 65 mph and up the car shakes when I hit the gas pedal but is smooth when I don't touch it. The same thing happens sometimes between 28 and 32 mph, also sometimes rarely when at a red light the car might try to jump forward. The other problem is that my windows and lock buttons don't work, but sometimes the driver window tries to work. The key fob works great. I really need some help so I can get the car safe enough to give to my nephew.

Update
 

I pulled the codes and they are as follows B2767 B3392 P0300 P0463 C0660 hope this helps

P0300 is a misfire code; so maybe faulty coil packs or spark plugs.

Po463 is a fuel gauge sender problem. This might cause the fuel gauge to give false readings but I wouldn't have thought it would give running problems.

B3392 is right front window switch circuit low. Maybe a bad connection at the plug or a faulty switch.

C0660 is an automatic level control code. Maybe a level sensor on the rear suspension or an air compressor fault.

B2767 would appear to be a driver side door lock switch/module.