For the past few days I have been noticing that at driving speeds the bullitt is studdering. It sounds weird, but thats the only way I know how to describe it. It does not 'hick-up' while accelerating, or even at highway speeds, only while maintaining driving speeds 30-50mph. Could it be the spark plugs? I don't realy want to pay some mechanic $300 to tell me that something is wrong with my car, and I don't want to start buying unnecisary parts for my car either. I have a SCT3 tuner that can data log, but I have no clue as to what its telling me. Any Ideas?