Motor dies after startup.

All yesterday after I adjusted the idle screws on the car, it ran like a top. Took it on some short jaunts around the neighborhood and when I was pretty confident with the motor decided to take it out on the freeway and back for a longer drive.

This morning I fire it up and there's excessive shaking of the motor. It shakes at idle (in park), badly in reverse, and when I'm in drive it has a dull rattling sound when I try to accelerate. I noticed some minor vibration yesterday but it was not like this.

Any thoughts?