Poor starting

[Bumpymark937]

Hi guys can anyone help with a problem with my Mo 11 Megane,problem is it starts but cuts out after few seconds,rac came out and diagnosed cam and crank sensor faults,replaced them to no avail next bit replaced was map sensor but still same issue,I cleaned the throttle body but it wasn’t that dirty,my mate who runs a garage advised me to replace coil pack and plugs,so waiting for them to be delivered,if this fails to sort problem out any suggestions as to where the fault lies?also the battery is loosing its charge but only since this issue arose,any help would be appreciated, thanks mark.