Steve, i've got the same bug. Sometimes my idle comes back down when it's warm... sometimes not. I pulled the ISC motor (what a pain) and gave it a clean & lube.. but didn't help. Think it could be an intermittent coil. Guess i'll have to pull it out and test it proper.

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Martin Q
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Dk Blue '90 TSI AWD (grinding Xfer case)

90 TSi AWD