[Richard2112]

" The confusing part for many is that a carburetor will suffer the most dramatic icing when the ambient temperature is between 45 and 50 degrees F--well above freezing."

That is odd but it seems like exactly what I've been experiencing since the weather has dropped into that range.

" In very short order (30 seconds to a minute), the ice melts from the underhood heat, and the engine starts and runs fine, as if nothing happened"

I've replaced both fuel filters and though that has helped in the acceleration department, when I pull to a stop, the engine dies. Thirty seconds later, starts and runs fine (for a little while).

Possibility of icing hadn't occurred to me. Interesting.