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Could be one of many things! I'd start with the cheapest first which would be the temperature sender. This reads the resistance of the coolant and sends information to the cars
to help it decide how much fuel/air mix is needed. If the sensor is duff, the car could think it needs the wrong mixture c reating an over fuelling issue....hence the high revs!
Worth a shot and the part should cost you less than a score
Report back here with the results. If it ain't that maybe we could point you in another direction.
Welcome to the forums by the way
Currently in scatz's garage:
2004 Subaru Legacy GT Spec B, a 2013 2.0 TDCi Titanium X Sport S-Max and a 2001 Honda NSR125R