A few weeks ago i bought a new stihl fs 100rx trimmer. First day i got it ran great. the next day, as in overnight...it was leaking fuel out of the air filter...i took it to the dealer and they said nothing was wrong with it and that it started right up. Howvever..the next day it wouldnt start. at all. The day after that..started right up and ran great. Its back and forth between this and i cant figure it out and im getting very aggrivated with it! im gonna try putting a new spark plug in and if that doesnt work its going back to the dealer and they better figure it out. any advice?