Issues with Z-Spray Max

[jtq0919]

Hey guys not sure if this is the right place to post this but we have been having some issues with our Z-Spray Max. Whenever it is damp or gets a little bit wet such as driving through grass with dew on it or if it is drizzling a little our machine starts backfiring almost like it is only running on one cylinder. the coils on it have gotten extremely rusted, we replaced them once and are looking for an alternative fix instead of replacing these once a year. Just wondering if there have been any similar issues with anyone else and if anyone has any more permanent fixes. Thanks!