Slight missfire at around 5k?

My 2003 WR450 has got a slight missfire at around 5k, which is really annoying as its in supermoto trim and 5k seems to be where it wants to cruise at. Have not had it long and the previous owner said it was say for 6 months in his garage before i bought it. Could it be a simple case of changing the plug?

Do a search, WR450's dont like to cruise at steady throttle. Affects my '06, but dont spend much time on the road so I live with it.

My 04 does this. Unplug the TPS to see if it gets better. If do, that's your issue and search the forum for the work arounds.

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