I changed a wire on my engine and machined my rotors.

Now my car doesn't shake as much, but it still shakes a little when in drive with the brake pressed. Is the shaking a given since it has 135k miles?

The acceleration is better but it still jerks a little but now it also jerks when deccelerating. What could be the problem?

Both problems seem to be worse when the AC is on... Does that mean anything?

Oh yeah, I have a rust hole just a little below the left side window, is there any quick way to patch it up?