Hi Mike, the motor in the actuator may not be able to properly position the throttle blade during cold start-up. I've seen a few actuators cause this problem. Assuming everything else is OK, why not let the dealer install a new actuator and see what happens? They can always re-install the old one if the problem isn't fixed. I've had to use this approach many times. Sometimes the only way to know for sure is to try. Contrary to popular belief, there isn't a conclusive test for every single failure scenario. Good luck.