Have a 1997 Ford F-150 it just recently starting this clicking noise that I can hear and feel in the gas pedal when I accelerate at speeds from 45-55 mph with a slight hesitation, not as noticeable as the clicking noise/ feeling in the pedal. The problem does not change when OD is off. Was told it could be coil pack? Looking for more and or any advice as to what my problem could be! Thanks