My 05 foreman 500 es just starts spitting when you gun it from a stop or in third if you dog it in 1st and 2nd, it idles fine, it sparks lite blue, it looks like my filter is clean, my factory snorkel is hooked up right. I would think it has to be the gas line any suggestions? My HMF does have a small leak and I did jet it. Also how hard is it to change the rear brakes.