I have an 06 GT with 89,000 miles on it. Between 2k and 4k rpm's it sputters bad and it comes out of it and runs fine. I took it to a shop i trust and the drove it and hooked it up to something i didnt see what it was and it said that #7 had missed 39 times. Now he says that its plugs maybe even a coil pack so im taking it in first thing tmrw morning...my ? is does his diagnosis sound right to yall or could it be something else?????