When i turn on my a/c at max ac and 2 the fourth dot and i'm idling my tach needle will go up and down then go down and die but if i turn it off or lower it will be fine. Whats goin on here?
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Should have two 8 or 10mm bolts that hold it down and a gasket. You could start by getting some carb cleaner and trying to clean it out, but it will more than likely be bad.
BTW I don't really know if this is the issue at all. It could be your A/C fan clutch or condensor. I would check it out first. I was only showing you where the IAC was.