My car is really old but, it takes about 3 times to turn it on until it stays on. It starts bucking for the first 2 minutes when I drive it and it won't go over 5 mph. Then, there is tension in the brake and it won't go down all the way to the floor like it usually does. To top it off, the car smells horrible and there is steam/smoke comming from under the car when I turn it off. The check engine light has not turned on, and engine temp gauge is fine. HELP!!