revs shoot up to 1500rpm on idle?

matt5594

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as i was parking up today, handbrake on, car into neutral, off the clutch and without touching the accelerator, the revs shot up to 1500rpm, then slow went back to the usual 800-900rpm idle.

any ideas why it did that?

(i am due to have the throtte body cleaned and coolant temp sensor replaced in the few days)