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I'm pretty sure i said this before but it's more than likely ur 02 sensor. you said the car runs better without it in which means that it is probably sending wrong information to ur ecu and in turn is causing ur car to act up. iacv if bad will usually cause the car to have a low idle. a way to check iacv is to unplug one of the plugs and if there's a difference in idle it should be working if not replace it.
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