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I am driving my Jeep along the road at about 120 km/h and the rpm will start jumping around from about 2000rpm to about 2500rpm.It will do it for a while then settle down and then do it again.I replaced the idle control unit about 6 months ago and this helped .Do you think i need to replace it again or not.It will only shoot up and down to 2500rpm ,it does not stay up there but it is a weird feeling when you are driving at a constant speed but the vehicle feels like it is changing gear or speed .Any ideas appreciated.