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Very possible that the throttle plates in the carbs for the respective cylinders are not uncovering the idle mixture port within the carburetor, hence no fuel getting to those cylinders and thus no temprature. VERY slight twisting of the throttle shaft is required. When they begin to emit fuel the engine speed will pick up and be smoother.
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Rick
As you slide down the Banister of Life, may the splinters never be pointing the wrong way 
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