It is on top of the valve cover next to the oil filler cap held onto the side of the intake manifold with a 6mm hex nut. Loosen the nut, pull off the hoses connected to it (be sure to have about 4 small hose clamps to replce the current ones). Clean with air intake cleaner, whichever you prefer, and watch all of the black stuff come out of the icv. I did this last week on my gf's jetta and it smoothed out the idle
also I cleaned the MAF and changed the plugs and her car runs like a champ!
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