I know that this subject has been covered a million times but my car is acting strange. about a week ago I went out to go to work at 5 am and the car would only turn over, it wouldn't hit one bit. I ended up taking my porsche to work. I came home and worked on it. At the time there seemed to be no spark, so I replaced the coil. walah it ran. now a week later the car is doing the same thing again, but it will start once the weather warms up around 2 in the afternoon? then it runs fine until the next cold morning. I can hear the fuel pump running and the cold start valve clicking under the hood. any help would be appreciated this is driving me crazy..... thanks in advance