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I'm after a complete engine bay loom for an early distributor based VR6. It's for a Corrado, but shouldn't think the mk3 golf one would be any different Thanks

My 1992 Corrado VR6 has an annoying high idle issue. It will idle at around 1200rpm. Sometimes, it idles fine, but 90% of the time sits there at 1200 rpm. Any ideas what could cause this? I have read that there is an idle speed screw on the throttle body, but I can't find it. Does anyone know the location of it please, if it exists? Thanks