I worked for Renault UK for eight years and tend to agree with the above post common faults for misfiring are the coils best to replace them with the later beru coil alot better, but no need to replace them in pAirs DONT buy on eBay they don't last. throttle bodies due get full of crap so a good clean will sort that. If the engine is a K4M+ then it has Vvt and again they have problems, but when changing the dephaser change cambelt at same time.
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