2001 Random Missfiring!!! HELP!!!
 

My 2001 pontiac grand am has 124000 miles on it so about half dead but it should run better. The service engine soon light is on and in a low gear it is more noticable basicaly the whole car shakes a little bit. When i popped the hood and looked at the engine it seemed to be shaking way too much. I took it to a shop he said that the computer told him that the car was "randomly missfiring" which could be anything. Please if anyone has any help for me that would be great.