97 yukon p0300 after sitting 2 months

Hey guys my yukon sat in the driveway for 2 months when I got back and started it up it idled like arse. It ran perfect before I left but now I just dont know where to start? Any sug. Thank you in advance M. Rod.

Welcome to AF. A misfire that can be felt could be a corroded/ loose wire, bad, plug, wetness in the dist cap, bad cap. All issues to be checked out. No quick answer for a random misfire code, all basic diagnostics.