While cruising at highway speeds and having to come to a stop the cars idle goes extremely low and acts like it wants to stall. I recently replaced the aftermarket intake with the OEM one. This is not a pzev engine. Thinking this may be the culprit. It helped with the erratic idling. But this problem still remains. I have checked all over for vacuum leaks and can not find any. Car idles fine if parked and not moving. I have also replaced the throttle body as well.