After searching and coming up with a Map Sensor I figured I'd double check what you all think.

My buddies 94 3 cyl 5spd Metro, runs very rough when it first starts up after sitting all day at work. Since we work together, I followed him out and observed the engine.

Upon start up, this engine literally moves 1 inch each way violently. You can see the front pass. motor mount dancing like crazy. After about 2 minutes it completely goes away. Any ideas??

He also noted he's only getting 40 mpg on a good week.

Engine Coolant Temp sensor comes to mind.

-MechanicMatt