Civic suddenly revs

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Good day po.. i just want to ask, my honda civic 1997 just suddenly increases rpm when ever i step on the gas... i tried to observe when i happens, and i noticed that when ever i reach 30 ro 40 kph may rpm just suddenly shoots... para tuloy nirerevolution un kotse bigla.. i release the gas pedal and it stops.. ano kaya nangyari? Thanks in advance.

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