I understand that my LHS has Coil-on-plug ignition. Apparently that is why the replacement splark plug wire set that I just ordered has those long plastic tubes? How do I remove the existing wires? When I pull up on the forward-most spark plug wire on the passenger side (which seems to be the most accessible) it doesn't seem to want to move and I don't want to break it with too much force. Is there a detail or trick to removing these that I should be aware of? Any help will be appreciated...