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Q: Intermittent clectronic throttle control(ETC) light after cleaning throttle body on 2007 Chrysler Pacifica

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
78,xxx miles on a 3.8 2007 Pacifica. Went to clean the throttle body, but the back side of the butterfly plate was sooo heavily caked, the only way to effectively clean it was to remove the throttle body. I took it off the car and removed the plate. After soaking it in solvent and sacrubbing for a while with a rag, got it prefectly clean and reinstalled. Now, the ECT light, a lightning bolt inside backwards parenthesis )(, comes on intermittently, but fairly regularly.

When idling, it comes on for a second every 3 or 4 seconds, and the engine speed surges momentarily (a couple hundred RPMs). When accelerating, or when cruising at a decent speed (45+ mph), the light seems to stay off. But when coasting down, it sometimes comes on as the engine speed drops. It might just blink on then off, or it may stay on for several seconds. Over the course of a 25 mile drive, the car went into limp mode, with the ECT light and the traction control light illuminated. Turning the car off and restarting got rid of limp mode.

I removed the battery cable for 15 seconds and have no OBD codes. No check engine light. I thought this would force a relearn of the throttle position in case that was the problem. I'm out ideas at the moment, and I don't have a dealer around me that I feel I can trust. Help!
No car image 94a1663db56199c5353592009e34aaa51078a2469bed068bb8d6f0ba43accf97
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