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Update- I changed the K20 RSX IACV for the proper Civic D17 one, which converted the constant high idle to an intermittent high idle while coasting.
After changing the IACV Saturday, I took it for a test drive and the idle was perfect- steady 750-800 RPM sitting still or rolling whether the AC is on or not, which is the first time I have seen that with this transmission. Awesome! The perfect idle continued until I got to college Monday.
Then on the way home, it started idling high again while rolling but not as high- 1K to 1500 RPM. Sometimes turning the AC on increased it like before and sometimes it didn't.
Thinking perhaps something in the brake booster was intermittently causing a vacuum leak, I disconnected the hose and plugged it off with a bolt to completely eliminate it as a variable.
On the way to college this morning the idle was perfect, but on the way home it started acting up again and sometimes idling high while I'm rolling.
I'm starting to wonder if the ECU is screwed up.
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