I'm new here guys and I need a christmas miracle. Here I am at my shop on Christmas eve, trying to diagnose a hard start problem for a college kid who is only in town for the holidays. The car is very hard to start cold. He had this problem last winter, but just delt with it. During the warmer months, it starts fine. But with temps below 65-70, hard to start and once started, blows blueish fuel smoke from exhaust. Once it warms up the car runs fine. Another shop has already replace cold start injector and coolant temp sensor. I replaced spark plugs yesterday...they were fuel fouled and corroded. This made no difference. I believe in miracles...can ya'll help me out?