No problem. If the wires have not been changed, there is about a
99.99999999999999% chance that this is your car's problem with the
shuddering. A new set of NGK blue wires should be about $35.00 from your
dealer. You can also order them from Trussville Mazda or Mazda South.

BTW, if you want to end the water noise now without doing the full job
of enlarging the holes right now, a quick poke with an icepick in the
clogged drain holes will let the water out. This is probably a good idea
anyway since you will want the metal to be dry if and when you enlarge
the holes and re-paint the bare metal that is left from drilling.

Good luck,

pat