Haha.... I know edy... Start engine n pull spark plug 1 by 1. Since u mentioned abt plug 4. Hehe, call ur mechanic to test wet n dry compression test. Then u know what I mean....
I always come to zth these days and find for info or to anwser question.
But there are several question these days that already has the threads created long before. Anwsers were already there but then new threads...