Hi guys! I need expert analysis and opinion about my Evo Iv's idle problem, i hope you could help me figure it out what's wrong with my car.

here is a link of my video while my car is on idle after warm up:

http://www.youtube.com/watch?v=zwuyV_crSzM

I recently changed my plugs with 7 heat range hoping that it was the one causing the problem but the bad idling still persist.

when I checked my plugs after a couple of weeks one of the plugs seemed to be burning less fuel, it is forming a black deposite all over it.

I decided then to change one of the two ignition coil, the one assigned to the plug that i think burns less fuel, but its still the same.


I will appreciate suggestions and opinions guys thanks!

 

Need to hear the engine not the exhaust.

 

Will post later engine video

 

Check all your hoses going to Intake mani, i had a hose pop off and the idle became rough and iradic.GL i hope its something simple