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several things could cause it.

a sticking throttle cable (if its not a drive by wire system/available after 01)

a stuck injector

a stuck throttle body

or possibly a short in the cruise control system

mine kept increasing speed on it's own and it was the temperature sensor telling the computer that the car was still running cold so the computer was putting more fuel to the engine,nz$250 to replace sensor now running perfect

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15y ago

What else can I help you with?