I need your wisdom guys, I have a 03 lancer es with 126k. I have changed the following: The throttle position valve, manifold absolute intake air pressure MAP sensor, Idle air control valve, and EGR valve, I clean the throttle body (without taking it off), cleaned anything having to do with the air intake, my idling it has improved a lot but still is acting weird, some times is going up with putting a gear sometimes is going low with putting a gear... sometimes acting when I am turning AC on or sometimes acting when I just turn my wheels... AND SOMETIMES works perfectly... ( i tried to change the EGR valve control switch vacuum solenoid but is hard to reach) I tried to search for a leak but I can spot anything, and my throttle wire is not loose either)... also, is not giving any codes either. That idle problem became very annoying and I can't figure out what else to do... I read the posts here, I check youtube videos and II ask people around. The truth is I didn't go to a mechanic because they are very expensive and I can't afford them. So if anyone can help me I will highly appreciate it.