Mitsubishi Repair: shaky motor, angle valve job, piston rings

Question
I have a 2001 eclipse gs and recently i decided to take to a shop and have some machine work done. i had the head port and polished a three angle valve job and new piston rings put on. the mechanic has put everything back together and now the motor is shaking when i put the car into gear. it is also saying that #4 cyl. is misfiring. i have changed the wires, plugs, and even the coils i cant figure this one out can you please help!

Answer
Mark: Take it back to the shop that did your work. They must have not put something back together right. You might have a sensor out some place, or your car's computer needs to be reset. To work on some cars you need to loosen a motor mount. Could be that was never tighten back down. You need to have that mechanic recheck his work, you paid good money for that work to be done and now get him to fix the car like it was well better before you bought it in to him. Hope this helps and good luck!