Help with motor

I have a 95 integra and when you start it the rpms and speedometer just fly up. the gas peddle is all the way up and the throttle cable is fine. you can only have it run for about 3 seconds and you have to turn it off and it is in park.

Could be a huge vacuum leak but I don't know what would cause the speedo to go crazy. When did this start?

does the engine rev up, or just the guages? id guess its an electrical problem