I have a 2007 9-3 aero. It suddenly started sputtering (and bucking, etc.) when it accelerates with the cruise control on. For example, going up a hill--as soon as it throttles up the bucking starts. Does not do this with cruise off. Since there are no dealerships I took it to an independant mechanic who has Saab diagnostic computer. It whowed error codes to one of the ignition coils. That was replaced and it still did it. Hooking it to the computer again showed no codes. So we tried replacing all of the igniyion coils and spark plugs. It still does it--but ONLY when cruise is on. Ever heard of this anyone. What connection is there between the cruise and whatever is causing this?????