Today I left my house as normal. My garage temp is about 35°F. As i was pulling away, slightly downhill, my foot was off the gas. I moved from D5 to S/S, in 3rd gear. I pulled it back to 2nd before the intersection, and instead of getting engine braking, the car started accelerating when it went into 2nd gear!

After the corner, I dropped it into neutral to see what the idle speed is, and it was 2000 rpm. I kept driving another block, and checked the idle speed again, and it was about 800-900 rpm, like normal.

The car couldn't have warmed up THAT much in one block, especially since it was about 10°F outside.

This is the first time I've seen idling this fast. Anyone else have this happen?

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2000 3.2 TL, Paper maps.
Comptech axle-back exhaust.
225/55ZR-16 RE730s on OEM alloys.
205/55QR-16 Alpins on steel wheels w/covers (winter).

Pictures