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Old 07-28-2013, 05:23 PM
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Does the stumble occur under hard accel or normal driving?
If the secondary air door is opening too fast under hard accel, you get the infamous bog that gave us the name Quadra-bog. To control the opening rate you have to adjust the spring tension on the air door and/or the the rate of extension of the choke pulloff that is normally connected to the door linkage.
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