cylinder#2 misfire 2001
 

Mitsubishi Mirage 2001, 1.8L ES 4 Cylinder Mileage 11700.

I have the error code #300 first and made a tune up. After a couple of days, check engine lights up with error code #302. I changed spark plugs again. Misfire and check engine lights up again.

Vehicle vibrates especially when stopping at the stop sign or traffic when pressing break with transmission set to drive.

What can be the possible things?