Hard to get off Spark Plug Boots
If you ever have a spark plug boot that is hard to get off one way
that has worked good for me is to take a 2-3 foot 3/16 brake line and
screw it into a air nozzle and then file the end of the line to look
like a hypo needle and then insert it between the boot and wire and
give it a short blast of air. It will balloon out and then you can
pull it right off, once in a while if they are still stuck I will
spray a little brake clean in between the boot and wire and they slide
right off.