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i'd only rule out the iacv if it's idling poorly, under vaccuum (when you snap the throttle closed) i don't think you would notice a shitty (and bucking) idle as much as he's describing.
The motor mount is a good assumption. Just have someone rev up the car while you watch the motor and see how much it moves. Then bust out the wrench and a mirror so you can tighten and inspect them all.
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