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does anyone know where the the idle adj. screw is to 97 MKIV .need help . smog station says 1300 rpm is too high .
 

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there is a allen stud with a lock nut on it that you back off a few turns.
loosen the lock nut, then you back the stud off a few turns with an allen key/bit, then tighten the lock nut again when its good.

sometimes its just the throttle cable that is too tight, some people will raise the idle by tightening the cable instead of doing it the right way via the screw.
so first make sure the cable has a little slack (it is adjustable via the 2 nuts that mounts it to the bracket on the right of the pic), and if the idle is still high then adjust the screw.
you may need to readjust the tps after doing this. if the tps is in the wrong position the timing will be off when the emissions place goes to check it.

 
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