Mitsubishi Lancer Engine Idle Erratic

My Rpm Up And Down The Code No 21

Well It Started By The Idle Was Real Low (500- 600) Almost Cutting Off. Then At Stop Lights It Would Idle Down To 400 Where It Was Barely...

My Car Battery Has Been Acting Weird Lately. I Will Charge The Battery One Night And The Next Day It Will Seem To Be Almost Dead After A...

My Mitsubishi Lancer Experiences Cold Starts In Any Day And Any Weather (rainy Or Summer Times). I Am Able To Start The Engine Always On The...