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In article ,
(Greg) wrote:

My Mercury shop manual says you simply set them up so all the throttle plates
are seated in the idle position and that they all start to open at the same
time. That was the way the dealer mechanic did it when he set them up too. I
am
not sure there is a port to vacuum test them on a Merc.

Now that you mention it I'm not sure either.

What I need to know is how far the screws (near the mouth) need to be
backed out.