i have a auto 06 lancer. when im on park the car idles up and down, it feels like the lights flicker a bit but not a lot. when im on drive and on a dead stop it goes away. why does it do this when im on park but when im on a dead stop and on drive it doesnt?

 

I am having the exact same problem and with the exact same car. I am going to mess with it this weekend and will let u know what I figure out. Mine has been doing it for a while and actually had the engine light on, but I changed the 02 sensors, up and downstream and the light went off and it ran smooth for a while. However, the rpms and rough idling has returned and again it only does this in park.

 

Possible MAF sensor. Have you tried cleaning it? How long ago did you replace the spark plugs? Might want to check that also.

 

If your battery has been disconnected at all, that will cause it and your ECU needs to relearn idle. Let the car idle for 8 minutes and then go on a drive for 10 or more minutes. Car should be fine then.

 

Here's my prob. I've rotated the video but I still think it's processing. I know it's playing on it's ear at the moment. let me know i've been messing with this about 3 weeks now and it's driving me nuts and bolts!

Mitsubishi Lancer 2004 ES SRS Light Prob and check engine light - YouTube