Ok so I took my car to a service center and upon doing a dyno on it they had told me the No. 2 cylinder was misfiring.
It's really not that noticeable, but annoys me somehow.

I hear from doing some research that this is a common diagnosis when this Check engine light comes on. The car has the following done before I bought the car in Jan. 2007

* Distributor wires & spark plugs
* Mass air flow sensor
* Can't recall the others, but nothing major.

What can be done to resolve this solution step by step?
Should I replace the distributor cap & rotor first?
Will changing the fuel filter help?
How will I know if one of the fuel injectors are bad?
What is the usual step to cure a misfiring on the No. 2 cylinder?

Any advise would be a very warm welcome as I'm no mechanic by trade, but do not mind getting my hands dirty.

Thanks and await any suggestions, advise or links to this problem.