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could be a few things. recent things i've experienced, not just with clios, are when i removed my throttle body and refitted it, it would hesitate sometimes. another one is coolant temperature sensor, or thermostat. this is more hesitation though rather than a few seconds. is the engine getting upto temperature?
Does the speedo rev counter etc all die as well? As if so could just be a dodgy connection to the battery had this a while back with a previous car, i'd double check all the connections to the battery are in good nick and tight.