/diy/ - Do It Yourself

My '95 civic has some weird idling problem. Its a 5-speed and whenever stopped (or more specifically, not in gear) the engine surges between 1500 and 2000 rpm. Sometimes after driving for a bit it'll start to surge less, about 1000 1500.

I checked some boards and read about checking the PCV valve. So I did, and it was undamaged. So then, not being a mechanic and really knowing what I'm doing I found this thing (pic related) on the passenger side of the motor.

I'm not sure what it is, but it has four plugs. Two of which are corroded and falling apart on the inside, the other two look brand new being a shiny gold color.

Can /diy/ tell me if this is related to the idle problem, other things to check for the idle problem, and what the fuck this thing is and why shits corroded to hell?

>pic related
>the thing

will bump with pics I took of the plugs.