Sounds like you have an electrical loose connection. I would target the fuel pump relay. It is probably shutting off and coincidentally, reconnects when you stop and start again. Could also be the ECM, Mitsubishi has problems with these I have seen. Google your car make, year, and symptom. Read the blogs.
SOURCE: mitsubishi lancer service engine light comes on and rpm's high
same as mine
2000 Lancer cedia
SOURCE: My 1994 Mitsubishi Lancer (4g15) engine stops
Fuel pump
Testimonial: "It's the fuel pump indeed. Also the gas tank found to be very dirty. The fuel pump was replaced, fuel system cleaned, now the car runs perfectly."
SOURCE: cannot control engine rpm mitsubishi lancer engine
Your IACV idle air control valve has gone bad . When you put the car in gear does it take off and accelerate to about 50 MPH without touching the gas pedal ? Had the same problem. Part from Mitsubishi is about $435 PN # MR578268. It is about $30 to $50 dollars on any other car. If this is the problem, the IACV is located on the throttle body and is held on with three screws. I purchased the whole throttle body at a salvage yard for $40, took the IACV off and put it on my throttle body. Car works normal for now, I am looking for another spare. If enough people complain to MItsubishi and www-odi.nhtsa.dot.gov
http://schematicsdiagram.blogspot.com/2011/12/how-to-adjust-rpm-on-2009-dodge-charger.html
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Engine cuts out at 3000 RPM?http://schematicsdiagram.blogspot.com/2011/12/engine-cuts-out-at-3000-rpm.html
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Cold start problem and vehicle shudder around 2500 to 3500 rpms
http://repairhelpcenter.blogspot.com/2012/10/cold-start-problem-and-vehicle-shudder.html
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High rpm in neutral? Inconsistant high RPM in neutral?http://technoanswers.blogspot.in/2012/02/high-rpm-in-neutral-inconsistant-high.html
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Jetski Sputters and Low RPM? http://whatisbyme.blogspot.in/2012/07/jetski-sputters-and-low-rpm.html
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Fuel Injection Problem And RPM suddenly increaseshttp://whatisbyme.blogspot.in/2012/07/fuel-injection-problem-and-rpm-suddenly.html
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2005 Toyota Highlander: Engine runs hard RPM below 3000?http://whatisbyme.blogspot.in/2012/05/2005-toyota-highlander-engine-runs-hard.html
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1987 Toyota Camry: RPM Drops going Up hills?http://whatisbyme.blogspot.in/2012/05/1987-toyota-camry-rpm-drops-going-up.html
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Cruise Control stops working, Excessive cranks to start the engine and RPM goes max 2500 http://whoisbyme.blogspot.in/2012/07/cruise-control-stops-workingexcessive.html
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1990 Toyota 4Runner: Engine cuts off when reaches 2000 RPM?
http://whatisbyme.blogspot.in/2012/05/1990-toyota-4runner-engine-cuts-off.html
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1999 Toyota Camry: Erratic stalling and high engine RPM at idle?
http://whatisbyme.blogspot.in/2012/05/1999-toyota-camry-erratic-stalling-and.html
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1995 Toyota LS: Misfire at idle or low RPMhttp://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html
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Lexus RX: Tapping noise under Valve Cover At Low RPM?http://technoanswers.blogspot.in/2012/04/lexus-rx-tapping-noise-under-valve.html
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These will help.
Thanks.
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