what should i start to check or replace first
OBD 2 code P0301 cylinder 1 misfire detected on 2001 Mitsubishi Mirage
check for compression first. then the plug, wire and the injector.
You need compression, fuel and spark to fire. Check the plugs first, may just be a minor tuneup. Get back to me with an answer and we can go from there. Good luck.