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Something that is sometimes overlooked is the throttle butterflies MUST open up at the same time and RATE. This makes adjusting the throttle linkage critical in getting the engine running right. This can be a real pain to get right, but it is vital that the linkage be right.
Hint #1: with the sync tool and the idle air adjustment screws, it is possible to adjust each stack so they are pulling the same amount of air at idle but not at part throttle. This will make some cylinders lean or rich in relationship to the other cylinders...
Hint #2: lean cylinders will pop through the throttle bodies...
Hint #3 this is also true of weber carbs...
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