My engine has recently (for a few weeks) been having serious cold start problems. When it was still very good (nearly 10°C), a restless engine run, bad gas acceptance – but after 100 meters everything was nice again. At the icy temperatures at the moment (almost -20°C) – very rough engine run, nailing like an old taxi from the 70s, very bad gas acceptance (connected with real hopping – jerking would be undertried), partly the engine also goes off again. Under 2200 rpm. goes even nothing. The circus goes at least 5 minutes – then everything is nice again. As I said, the problem does not exist for long. I can’t understand it. Fuel filter was changed a few months ago, oil too. Warnings / error messages do not appear in the on-board computer, there are no warning lights. Someone an idea what this could be about? Reading error memory is currently bad (if, then only with a Gutmann tester at my free workshop, to Renault I would come in two months at the earliest).