I would like to add to John's comment one other scenario, and that is carb icing. Lack of heat, coupled with the right atmospheric conditions, ( cool damp day), fuel evaporation (which also absorbs heat), and manifold vacuum....all this makes ice under the throttle blades which causes stalling, and poor throttle response. think of the liabilities Chrysler would incur from lawsuits from accidents...just ask Ford. Water heat is an option, with some inventive plumbing...but not stock looking. The best choice is fix'em and maintain them with the Mopar heat riser lube you can buy at the dealer....if you are racing or whatever you can always wire it open till you are done racing . dan