2000 grizz 600 with 390 miles

I got a 2000 600 4×4 been sitting for 6-7years just rebuilt the carb changed oil filter air filter. It fired right up after I put it all back together ran it slow for awhile than ran it up to 30 around the block than took gravel up to 50 came back to the garage. Had a low idle so I turned up the idle a bit to level it out, than just like a switch it idled real high so i turned it back down. I put it in gear to pull in the garage and it stalled fired back up and the oil light was on flickering. I rev’d it up a little bit and it made a sputter on decel. Hoping one of you guys can shed some light as too what it could be

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