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The ecu is getting misinformation or no information from onme or more sensors, so check every wirring connection and make sure everything is making good contact and make sure everything is connected to the proper location. Then see what happens.
And the car will not idle right until it is warmed up b/c of the IAC being removed, but it should not cause this unless you don't have the sensor plugged in at all, try pluggin it in and see what happens. It may be that the ecu is not getting a response from the IAC and then goes into limp mode where it loads the motor up with fuel and only lets you rev to a set rpm.
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