My 2004 raptor 660 has an inconsistant idle. By that I mean when you pull the clutch or come to a stop the quad will idle high for about 10 seconds, then idle down to what I would call an oppropriate idle, then after about 30 seconds it will die. Mods are as follows: 27.5 idle jets, 155&160 main jet, pro design intake, prodesign foam filter, Bill's pipe. I run 100% 93 octane gas. It runs great, does not eat plugs, no back fires. Any advice would be helpful.