I am new to this forum but I have already learned so much about raptor's that I didn't know before. I have had an 03 660 for about 2 yrs and a 07 700 for about a year (love the 700). You guys seem pretty knowledgeable and I though I would ask for help before I took it in for professional help $$. The 03' 660 has run great since I bought it, I even put on a dynojet stage 2 kit about 6 months ago and took it to the dunes. It has run fine until lately when it started giving me trouble. It has yosimura exhaust, big gun rev box, k&n filter with open top air box, dynojet kit stage 2 (144 & 146 jets), and I just put a new spark plug in it. It will start and idle fine, off idle to maybe 1/2 throttle it is very choppy but after 1/2 throttle it will take off. It also seems like I have to constantly adjust the idle up and down. The most agravating part is if I go up any type of hill sometimes it will die and will NOT restart for a few minutes no matter what I try. After it does start I can drive it shut it off and it will fire up right away every time. I have taken apart the carb a few times and checked everything (not an expert at all) but can't find any issues. If it had something to do with the jet kit I'm not sure what changed because it did run fine for a while. Sorry for the long post, any help would be appreciated! Thanks!