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Loss of power and backfire

  clio campus sport
I have a 2008 Renault Clio campus sport 1.2 16v. I was driving home last Monday when my car started cutting out, loosing power whilst I was driving. It idles fine but when you take your foot off the accelerator it back fires and it looses power randomly when driving and then regains power. Largely around stopping and changing gear but does sometimes happen between aswell. I have replaced coil pack, spark plugs and leads, catalytic converter and fuel filter and pump and it is still not right if not worse. It's showing no fault codes. Any suggestions? I'm a week in and a few hundred down so could use ideas as to what to look for next