There is a vacum connection that went to a valve in the hoses coming outta the air pump. If that was not pluged, then you have a vacum leak, causing the rough idle.
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-1993 Mustang, 900rwhp 03-04 cobra based 4v swap, full Griggs setup, project underway
-1994 Ranger w/ 427cid windsor (daily beater)
check it out!
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