I have been playing with this Mustang for about a year. It runs great when the weather is warm. When the temp gets down to 50 or less, it refuses to start. It spins over fine. I can raise the hood and let the sun shine on it and it will start after it warms up a bit. I have taken a hair dryer and blew warm air on sensors that will keep the car from starting but that changes nothing. I have tried unplugging sensors 1 at a time and trying to start it but that changes nothing. The engine is a 347 with a X303 cam, Edelbrock Performer heads with 1.6 roller rockers, new MSD distributor, MSD coil, Edelbrock electric fuel pump with adjustable pressure regulator which I have set for 25. The car is positioned so the sun shines on the passenger side so I am thinking it must be the mass air sensor or the coolant temp sensor. I have a spare mass air meter so I plugged it in but it still won't start. Any suggestions?