I purchased a 93 arctic cat ext 550 efi a couple of months ago. I rode it a couple of times without a hitch but this last time it started acting funny and eventually died. While it was running it would start to idle pretty high for a couple of minutes then back down to a normal level. While riding it, it would start to bog down then it would just take off at almost full throttle. After it died I couldn't get it started again, but did notice that the efi controller or something in that area was clicking while the key was on. I turned the key off and it stopped clicking. I loaded it up and home we went. When I got home I put the key in and it didn't click and after a couple of pulls it started. I shut it back down and turned the key back on and the clicking started back up and wouldn't start again. Would appreciate any advice before I take it to a shop!