Is it normal for these vehicles to have poor response? My old '92 subaru legacy jumped every time you touched the gas pedal, but my mystique needs to be given more effort to get it going. I purchased the vehicle with 12,000 miles from carmax, so I changed the fuel filter, air filter, oil, but none of those helped. Just wondering, because the day I test drove the vehicle, I got the same reaction from a contour that was also at carmax. Both of the cars have a duratec engine. If its normal, then what would give it a quicker response? BTW, the original plugs and wires have not been changed.