hi, steve here. firstly, thanks for the welcome/help. my megane kept cutting out. mostly at traffic lights, just when i got a green light.:even misfiring at speed. my engine management light flashes when it does this. i was told [ renault mechanic] 3 things to check, manifold air pressure sensor pipe, [ check if loose, or split ] . engine earth lead,.may be loose. or he said, you might need new coils, [ they get a lot of heat on top of engine.] also, i was told ,just bring it in [to a dealers] to put on diagnostic computer ! o2 sensor fault ? i changed the m.a.p.s. pipe, & put a new earth lead on, result. engine light is off. no misfiring / cutting out. for me anyway. [didnt change coils ] on my megane mk1 1.6 hope this helps, guys. cheers for now.