High Idle around 2k RPM

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Hey what's up guys?I'm new to the forums.My 240sx sr20det has been sitting for awhile...like 6 months.Go to start it up, everything seems to be fine.Except that it's idling quite high around 2kIt jumps around over and over from 1800-2200.Doesn't always do the jumping of the RPMS.But it stays high.It is winter and quite cold, but i doubt it would stay up that high after warmed up.