I 've installed BERU Silicone and misfires stopped!!!!
I saw something else, I have installed an APEXi AVC-R, I ve allways had a problem with rpm readings when I've raised rpms higher than 5000 rpms, APEXi reading raised up to 9000 rpm when my real rev limiter is 7200rpm.
When I've changed my leads to BERU my APEXi AVC-R reading are ok, now I see 7210-7230