Hi! I have something similar on my 1.4 fiat stilo - everybody says that the car is perfect but engine cant start from first time during the 10-20 degree temperatures + all the things you mentioned. I also installed LPG and after it, all the problems started. I was so tired, that just called to STAG factory, they have kind a consultants and asked what could be a probled - they suggested me to change LPG ECU with the one what have second connection for another lambda what will work only for LPG and the petrol will work on original lambda. So now I am fighting with LPG installers that they change my LPG ECU with advanced with extra lambda. What are you thinking?
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