Renault Clio Expression 1.4 2007?

It could be an injection computer software problem. Usually with software issues you don't get any warning lights and the ecu will not show any fault codes. A renault dealer has access to a database on a a system called renault net. They just have to put your cars chis number in to the system, enter the symptom you have and then it should list all possible solutions to the problem, including software updates