P0304 cylinder 4 mis fire

[Fuller30]

hi, i have a audi a4 2.0t quattro sline on a 59 plate I was driving today and the car started to miss fire and my code reader said p304 cylinder 4miss fire.any idea what is causing this.

Car is back running fine at min but I didn't do anyone to solve the problem

 

[Steve Q]

I'd be looking at inspecting the coils, sparkplugs first and then injectors.