I have a 2002 mitsubishi lancer it shuts off whenever it goes into reverse and stutters while throttling it also seem to rev on its own while throttling

get your car fix right now
MITSUBISHI LANCER SERVICE REPAIR MANUAL 2000 2001 2002 2003 2004 2005 2006...

Is the Check engine light on?

when u adjusted the throttle did you reset your system set it to around 750rpms let it run for like 5min turn off unplug the battery both wires pos and neg for 5 mins put back and try again it should level out if not bring it to a shop could be something deeper or a o2 sensor

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

there's a regulator which adjusts the car rpm when ac is on
or it could be a vacuum hose check hoses

good day Sir, try to check the spark plugs and the fuel filter i hope this tips will help you.

If this an automatic replace your throttle cable located in the same place with that of the accelerator cable. Keep me posted.

try diconnect the positive terminal for about 30 mins or less for the computer reset it self if that don't work try cleaning the throttle body sensor with caborator cleaner below intake hole do this make the positive terminal is off, then put everything back together and go for a drive see what happen that had worked for good luck!!!.

try changeing the engine temp sensor. it is on the gear box side of the engine beside the thermostat with either two or four wires going into it

Idle is computer controlled and no way to increase it. May want to make sure the throttle body is clean. Use carb cleaner and a soft tooth brush to remove carbon buildup.