Engine management issue....get it to a garage for diagnosis. Is most likely fuel mixture, exhaust sensors or airflow meter. They usually run fast when cold but engine management should alter the mixture to give it less fuel as it gets hotter.
of course...as long as ur previa is the diesel one...
A dirty spark plug can cause your lawn tractor engine to run at high RPM. A bad fuel filter can also cause this.
Toyota 5K engines idle are: without vaccuum hoses attached but sealed = 750 rpm with attached vaccuum hoses and power steering = 850 rpm with aircon on and power steering attached = 900 rpm actually i run mine 5K toyota at 600 RPM with power steering but without aircon. With aircon on it should be at 800 RPM. or else its gonna be shaking. Ricky Recodo
An idle set too high can cause a 1994 Nissan Pathfinder to run at a high RPM in 5th gear. A bad transmission gasket can also cause this.
Flooring the gas petal.
Running slow with high rpm is a sign of slippage. If the vehicle is a straight drive then the clutch is not grabbing and is slipping, if its an automatic then the transmission is slipping internally.
A large vacuum leak could do that.
start engine with radiator cap open run at 5000 rpm until u seen no air
Yes, that is how they are made
If it's a stick, it sounds like the clutch or clutch componets.
becaues you have to put oil in the gas tank with alcohol cause its a alcohol engine
rings are burned and there is only enough compression to run the engine without load.