Changing coils
Your 01 should have COP (coil on plugs) not coil packs. They are just held on by a 7 mm bolt and will pull out. This thread will show the COPs, also did your mechanic torque the plugs to the new 28ft/lbs and not the lower old number?
https://www.f150forum.com/f72/97-03-...-change-93389/
https://www.f150forum.com/f72/97-03-...-change-93389/

