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The only thing 1 and 3 have in common are heater boxes. check for exhaust leaks. Do you have a crossover tube installed?
Are you sure you tightened those two front intake nuts as much as the rears? triple check everything! Check for vacuum leaks with carb cleaner spray around the base of the manifolds. I used to have some dellorto FRD single barrels and there were problems once a week. vacuum leaks all over. as soon as you fix one another is starting.
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