My girlfriend has a clio dci and it is having trouble ticking over from cold. It sounds like it is runnig on 3. I have had it plugged in and the fault read said it had a missfire on 1st and 2nd cylinder. It is fine when its warm just a pain on cold start. It has had new glow plugs, oil + filter, air filter and fuel filter.The head gasket is fine, I think it could be a sticking injector. Has any1 had trouble like this and what do people recomend to use as a fuel system cleaner. Thanks Gav