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I will try removing a spring. Just like the idea of two springs, plus must race events require dual springs.



My suggestion was just to remove one of the springs temporarily to see if reducing spring tension solves your problem. Problem may be something else entirely. Not sure what, but maybe the linkage connecting the two carbs is sticking a bit from the vibration when the motor's running, but not when it's not. ?? I know it only took a tiny burr on the connector linkage on my Hemi to cause a problem.