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Re: 3 days after buying - another problem, cutting out when starting up 2.0vvt
I've had similar issues with a megane 1.4. Assuming the air filter is clean and the HT is in good order.
I'd try cleaning the Air temperature sensor (somewhere on the air intake after the filter), the inlet manifold temperature sensor and the coolant temperature sensor. (halfway down the body of the engine, right hand side on the megane)
On the megane the ATS had 2 philips screws holding it in, the IMATS just clipped in, the CTS is mounted on a bolt with a hex head. All have multipin connectors going into them. Take an extra finger with you to check the CTS, otherwise you'll be pouring your coolant away.