[Bricklin] boiling fuel in carburetor

[JLC]

Hi....  came back from a drive in Colorado Springs this morning, and the
engine was intermittently missing on the way back. I checked the air
filter/carburetor, and noticed the fuel in the carburetor was boiling.
Outside temperature was about 65 degrees, and I was driving at a  moderate
speed (under 60 mph).  I changed or touched nothing on the car since its
last run, when I had no problems. The engine temperature was below 190
degrees. 

Have any of you experienced that problem? 

JLC
#2121