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troophall

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troophall
when driving at a steady speed of say 50mph the revs suddenly jump from say 2000rpm to 4500rpm and then drop to 3000 and then back up and down for some time.any ideas why.
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troophall
the revs are erratic jumping up and down . any ideas whats wrong
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troophall
sometimes when driving at a steady speed the revs suddenly become erratic jumping from say 2000rpm to 4500rpm and then drop then suddenly go up again. any idea what is wrong?

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