Started the wife's GX ('05 with 5,500 miles) the other morning after being in the garage for a couple of days and was alarmed by an atypical start - fairly rough vibration (almost like a spark plug was disconnected) from engine compartment which thankfully subsided after a couple of seconds. Anyone else experience abnormal starts with noticable (temporary) vibration from the engine upon starting. I realize this is a vague description and could be anything, but it was enough of an issue to get the heart rising - definitely abnormal. I definitely will inquire with the dealer at my next visit (unless this occurs again and I will go immediately). Until then, anyone have any thoughts as to what this could have been?