Original poster here replying from a different computer. After checking the dipstick again (all looked good) and messing around in the engine bay, I decided to take the car for a short drive. Four times around the neighborhood and the grey smoke disappeared. I also saw a trail of water in the driveway coming from the exhaust pipe when I left the garage. I was elated! No CEL codes so--fingers crossed--this is apparently not a AOS problem. However, I removed the big cold air tube connecting to the throttle body (not the little tube just off the throttle body) and for the life of me I cannot get it back into place. GAAA!!!! The throttle body connection has a ridge over which the plastic piece has to slip before you can tighten the clamp. Try as I might, I can't get the tube
over the ridge. I feel like an idiot! ANY SUGGESTIONS?