The high idle is a result of the CEL. Certain CEL's put the engine into a failsafe mode with high idle and restricted timing. You can reset the CEL and you might be good for a little while, check for any exhaust leaks near the cats that might throw off O2 sensor readings.
I had similar issues after installing the Stillen G3's in combination with high-flow cats and cat-back exhaust. Once I got a tune everything was good.
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