I got this code at first start in the morning. The car crank n it run but I can feel engine shaking little bit if I don't driver or drive. I had spark plug changed 20,000 miles ago but we never change coil wire never. I had p1238 code but I rested that code n it never came back expect mis fire code p0300.

Idk what should I do first? I don't want this motor to died on me bec is my 2nd motor.

We find this motor at junk yard which been sitting there for 5 yrs with 1,000 miles on it.

Please help.

Thank u n sorry for my bad English.