Car is acting up Mercury Topaz

I have a 1990 mercury topaz with 120k and is a v4. When I first got it, it ran like new but its been a couple months now and ive noticed that I have trouble going up hills. Also when I start driving to fast the car will start to shake and almost feel like it is about to fall apart. One more thing my car is burning heavy oil, like I go through a bottle a day and I even tho it looks like its not leaking when I lift up the hood its all over the top of the hood and all over the wires and engine. Thanks.