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Marcelo:
I don't think you can replace the boots alone. I have not done so, but I think they are connected at the spark plug end to the wires.
Try to remove them; however, with a flashlight or strong light look to see if they are removable. If they are, then be sure to use silicon spray or some such (vegetable oil is okay too), to keep from damaging the ends that attache to the plugs. Availability of the boots alone might require some research.
Quite frankly, I have never heard of the air filter cover leaking, IF it is intact, IF holes have not been drilled to aid "breathing", and IF the rubber straps are still pliable. The cover fits over the airbox with outside flanges, and all water should divert over the cover, and not get into the air filter, and down onto the pulleys, thence out the drain holes of the sheetmetal. But Warren is right, check this also. If your air filter is wet, then that is the cause.
However, if there is electrical shocking to you when you touch the wires, you have isolated one potential source of shorting, and that might be your problem. Others have suggested looking into the engine compartment in a dark room or at night, to see if there is arcing from the wires to metal, but I have never successfully seen such arcing.
This problem does sound to me to be electrical in nature, so be patient in looking at the entire electrical path from the distributor to your plugs.....Andras
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