My Meg sometimes starts like this.. like it is running on 3 cyl only.. and sometimes I get a blinking check engine light whit a missfire on third cylinder.. And sometimes it starts smoothly..
Any help what could be the reason..?

Megane 3 Coupe 2.0 TCe 180hp with BMC air filter and cat-back..

youtube.com/watch?v=VFmmom5xF9U