John - this is interesting as you're the first person I've heard of having issues with these carbs out of the box. Have you checked for a vacuum leak between the carb and intake? Being that their new I would contact Edelbrock and discuss this with them.
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1997 Silverton 362, 7.4 Crusaders
1997 2400 SCR, 5.7 Vortec / Bravo 2
Mike
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