So to be clear, the gas pedal is not operating the way it should. When you let off of the gas, it stops accelerating, right? If so, then we're off to a good start.
Driving the car with the brakes pressed has probably worn out the pads. It might've even overheated the rotors, causing them to warp a little bit. If the car is shaking when you push the brakes, then the rotors have definitely warped. It's probably time to change the brake pads. And if the car shakes when pressing the brakes, then you should also take the rotors and get them resurfaced. I can get you instructions on how to do that if needed.
I'm including AllData's instructions on how to change the brake pads on your car in the attached images. Also, I have some additional tips: (1) Take pictures as you go through the process, so you can reference them if needed. (2) You probably don't have a lift at home, so use a jack and back it up with a jack stand under the frame of the car. (3) If you've not added brake fluid to the master cylinder, do not remove any. If you have added some, don't worry about it just yet, excess will come out on it's own in a later step, just wash it off of the painted surfaces quickly. (4) You can use "brake parts cleaner" that the auto parts stores sell to clean things up. (5) Spray some "white lithium grease" on the caliper pins to keep them lubed. (6) They sell a suitable assembly paste at the parts stores, just use that instead of the "M-77 Assembly paste." (7) A larger c-clamp can be used in place of a brake caliper compressor tool, just put an old brake pad on the caliper piston so the clamp doesn't damage the piston. (8) Be absolutely sure to push the brakes all the way at least 10 times before driving anywhere, or you'll be driving with no brakes at all. Also, you can do this entire job with a basic set of wrenches (metric sizes) and a 6 inch or larger c-clamp without trouble.
Here's our general how-to guide on brakes: https://www.2carpros.com/articles/how-to-replace-front-brake-pads-and-rotors-fwd
I'm also including a link to a youtube video (not one of ours though) on doing the brakes on your car: https://www.youtube.com/watch?v=RktXFq_1XrU
Hopefully this information helps you.
Images (Click to enlarge)
Monday, March 4th, 2019 AT 4:06 AM