Last fall, the bro's red 370Z had the same symptoms, high idle, even threw a CEL code P0170 I believe. Would have to check the paperwork for sure. Any-who dealer spent hours diagnosing it to to no end. They called Nissan Tech Support Line and they said to check the grounds. I believe there are 4 or 5 ground spots on the 370Z. So they found the engine to firewall ground was rusty.....bam...cleaned it up and has not happened again. Just a thought if Jordo's suspicions don't pan out. g/l.
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