My car has a few problems...

1. In idle or in drive with the brake pressed, my car shakes violently like it's going to stall but doesn't. It previously did this in Feb, so I had the rotors machined and spark plug wire changed. That fixed the violent shaking but the car still shook in drive with the brake pressed. Should I change the wires again?

2. When driving, the car feels like it's bouncing or very slightly jerking back and forth. Any ideas?

3. I have rust pockets underneath both windows.

4. When accelerating at any speed but more so at a low speed, the car shakes. Also, the car kicks back and forth between gears when deccelerating (automatic transmission).

5. After a 10 minute drive, I see faint smoke coming out from the hood and my radiator fluid seems to always be low. What could be causing that?

My Integra has 139k miles. Is it time to get rid of the car or are these things worth fixing?