92 Saturn sl1 4-door sedan when you start it it revs out of control then goes down for a little then back up what is it?

First, check the accellerator linkage cable to make sure that it is travelling properly and returning to idle position. If that's not the problem, you have a vacuum leak and it's probably a big one. Answer 2 Other possible causes: Fault in the fuel or electrical systems; plugged PCV valve; air filter clogged; fuel pump not delivering suffucient fuel; leaking head gasket; camshaft lobes worn.