Rough running Car

[kimlinh]

I can't figure out what is wrong with my car. It is a fully restored 29 Model A sedan. The car ran great until lately. Now when the car first starts it runs fine, but after a couple of miles the engine starts to misfire. The problem gets worse as the car warms up. The coil, points and condenser are fairly new. The gas tank, gas lines and carburetor are clean. This was a great running car until this started. Does anybody have any ideas?

Thanks in advance