Anyone got any ideas as to why my Opel Astra Njoy 03 cuts out. The problem is ongoing for approx 2 years now. I have had it checked in local garage as well as Opel's computer system but no fault showed up. It only happens when engine has reached normal temperature,say after a minimum of 15 miles driving. It drives fine when cold. I have had pipes cleaned, had petrol additive tried and EGR replaced but still the problem persists. 89000 miles. Any ideas?