340 Not firing on all cylinders

Started the Dart up on the weekend for the first time since the winter and noticed it just didn't sound right (Didn't sound the greatest when I put it away in the fall to be honest!). So I took my infra red temp guage and took some readings at the manifold. Atleast one cylinder is definitely not firing (The readings on the left side back 2 cylinders were much colder but the back left was considerably colder than the rest).

I bet I know what is the problem......the gas in the carb jelled up over the winter and clogged the carb jets. Could be wrong, but I've got a hunch.....try spraying a little starting fluid in the carb while it's running and see if it perks up.