Register a free account today to become a member! Once signed in, you'll be able to participate on this site by adding your own topics and posts, as well as connect with other members through your own private inbox!
personally i'd say if its misfiring then dont use the car unless you really have to.
Get it down to renault and get them to plug the computer in. I think they charge about £35 to just look at it unless its under warranty, but seeing as yours is "modified" i doubt you'd be very lucky with any warranty claims anyway.