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Remove the fuel rail from the engine mounting, leaving all connections connected. Turn the key to on. Look around the fuel injectors to see if there is any fuel leaking from them. If so, they should be cleaned. It is possible that a torn diaphragm in either the fuel or air regulators would also cause the engine to rev very high like this.
If you can find a good location in the system to install a gauge that would be the best way to see if the regulators are functioning correctly. I could not locate a test point in the diagrams.