Misfire on cylinder 2&6 and random misfire code

Hello, as you can see I have valve cover gasket leak... I recently replaced the spark plug and it started giving me misfires. The leak is very small, should I just DIY replace coil pack & spark plugs for those cylinders and go on? Or replace valve cover , valve cover gasket , for $950 by the shop?

Also if I were to do it myself which part would I need to order? (2nd pic)

The car is Porsche Cayenne 2013 V6 Base Gas. Reason I'm asking is I will be using the car to tow for over 1000 miles. Also I don't feel like I lose any power or engine shake at all.