Have a 97 EB, took it to get diagnosed for a "tug" at 35mph, 55mph and 65mph. Ran a cylinder misfire check, came back as cyl 1 50 misfires, cyl 2 30 misfires, cyl 3 30 misfires, cyl 4 30 misfires, cyl 5 20 misfires, cyl 6 40 misfires, cyl 7 30 misfires, cyl 8 40 misfires. What can be causing...