Postby venum » May 20th, 2006, 9:21 pm
firstly you need to specify which engine that Lancer has
1.5L = 4G15 GDI
1.6L = 4G18
1.8L = 4G93 GDI
my initial thoughts are that the idle speed needs adjusting
happens without warning on my 4G15 non-GDI Lancer (1999 JDM)
just goes low\high sometimes
the idle control screw is located on the throttle body, usually covered with a little black cap
put the car in Park and adjust the screw until idle is back to normal ~ 700 - 800 rpm
I had this same prob, xcept in my case the idel went too low