Coupe sputters after running for a while

[mstover]

Need a Model A doctor to diagnose this new problem.

We finally have a nice day here in Ohio and I decided to take my '30 Coupe for a spin. It ran great for the first few miles but then started to sputter. It wasn't a backfire but a sudden loss in power then followed by a burst of power. This happened more and more frequently as we cut our trip short and headed for home. Any ideas as to the cause will be greatly appreciated.

Mike