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Once you clear the ecm, which it seems you have, let it sit and idle for a good long while (enough to get up to temp and run for a few minutes more) and see if it figures itself out. My older cars needed to do this when they were "Reset". They wouldn't come down if I kept interrupting it by driving or otherwise messing with the throttle.
Check the OBD2 signals to make sure it's registering the coolant temp properly, and the air intake temp as well. Stuck open EGR valve might do it. Leaky exhaust manifold might make it try and compensate for a lean condition. YMMV.
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