I have a 1994 polaris indy classic touring with a 500cc efi throttle body. Due to our lack of snow last year, this sled was only started once in the past 12 months. While getting ready for a this years (hopefully) season, I have discovered that the sled starts and idles just fine, but, spits and sputters on recieveing throttle. I have removed all old fuel, replaced the external filter, and filled tank with fresh priemium fuel along with plenty of Sea foam. Same result however. Are my injecters clogged? Any thoughts? Thank you.