Car has been fine but after 60 secs of enthusiastic driving, car started misfiring. Obd says P0300 random multi cylinder misfire. Had new 630 injectors and a remap in December at Engine Dynamics and I have today changed the coils and plugs. Plugs on 1 and 3 were not very tight which is why I assume there was some carbon on the base of the coils and the central electrode on cylinder 1 plug was non-existant but the two side electrodes were still there. Thought changing plugs and coils would fix the issue but still misfiring and even stalling same as before the switch. Not sure what the problem is now? Any ideas? Guess I need to take it to a garage for diagnostics/compression test so need to decide whether to use the local garage or a Renault specialist?