I have a 96 Sable that has been bucking at 40-45mph. My ignition coil pack keeps burning out, and when it does i feel that same exact bucking at all speeds and while idol. Makes me think its an engine miss of sorts. but even when i change my pack all other speeds go back to normal. Except 40-45. Changed spark plugs... and have been to 5 different mechanics that "have no clue" what it could be. Does anyone anywhere have a theory even. I just replaced my 4th ignition coil in less than a year... there is something burning them out and causing my car to buck at those speeds. Please help. (no check engine light on)