In cold and damp weather the Safrane usually seriously overfuels, rough running at 600 - 1000rpm with vibration (the back box rubbers broke yesterday) and strong half burned fuel smell from exhaust. The plugs are all sooty black. When hot or cold and dry and covered in frost (-1 degree) it starts perfectly! Have replaced the air reg valve, ECU coolant sensor and HT leads but no better. Looking perhaps to a vacuum leak or earth problem - the tailgate wiper and reversing lights are also playing up. Grateful please for any other ideas to keep me busy over the weekend! Many thanks.