OVER REVVING RANDOMLY IN MITSI VIENTO OR GALANTE 1996

OK, I have a 94 Galant with about 140,000 miles on it. This past month something really weird has happened to me three times that I'm hoping so Arsians out there can clue me in on.
My car normal idles at ~600rpm, put it in neutral this is where it sits or if you're stopped at a light. Well three times now when I started it up the engine starts revving. It will rev up and down between 1,100 and 1,600rpm. It will shoot up to 1,600, drop down and as soon as it hits 1,100 it shoots back up to 1,600, over and over. It does this when it's in park or neutral. If I sit in drive at a light it refuses to drop below 1,100rpm.
It just randomly happens, I'll start up my car to go to eat dinner and it does it, when I'm done with dinner and go home it's fine. I've tried turning it off and then back on immediately when it happens and it still does it. I've tried revving the engine in park and that doesn't affect anything. The only thing that seems to work is time, if I let it sit for 30+ minutes, next time I start it there is a very good chance it won't happen. However, the times it has happened my car has been sitting anywhere from 30 minutes to 4 hours. Like I said it's random.
Anyone have this happen to them? Anyone know why it's happening? Any advice is appreciated.

motor revving - CarGurus

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Transmission fluid is low

that is your idle air control valve. it is located on the throttle body next to the throttle position sensor

try using a scan tool to reset the ECM program after disconnecting the battery

USE A SCANNER TO CONFIRM WHETHER HAS ANY SOLENOIDS HAD TO DO WITH.

I'm not 100%, but check your crankshaft positioning sensor, or the mass air fuel sensor. one of those may be the culpret.

http://www.ebooksquad.com/search/galant%2Bwiring%2Bdiagram. ... they usually have free pdf downloads for most mitsubishi's.

inside the fuel tank normally under the backseat

This Vehicle needs an Idle air control/Idle speed motor. Good Luck