Munty Idle - B4/BH

[Marky]

Hi,

So bought a car last night, 99 GTB, drove perfecto. Today, run some errands and it starts to idle a bit dodge now & then at the lights - nothing major - tonight has gotten to the point of it will surge to about 1500, drop to almost stall, and repeat. I'm thinking intake leak or ISC fault but can't prove either, and no I haven't pulled codes yet.

I have had the idle thingymawhatsit off (the one above the throttle body) - it was pretty gunked up, brakekleen fixed that, BUT how much should I be able to move it by hand - does it rotate, move in/out or what? I can't remember how it works but doesn't seem right I can't move it by hand?

The OTHER thing I found was when checking for leaks I had the belt cover thing off - tucked between the intake pipe and the alternator is a little solenoid - the plastic nipples on that had both snapped. I blanked off the hose to and from it - but what does this solenoid do, and is it the cause of the problem maybe as well?

Does not have a BOV, has factory airbox etc.

Any help would be much appreciated

[Marky]

Alright, the internets tells me icv, icv, icv, maybe afm but icv anyway - so should I be able to move it by hand?

And still not 100% on what this solenoid is for, can't find anything online saying what it is and can't see where the hose from it goes to (the hose I have blanked off...)

[Marky]

Thanks internet, you rule

I believe this may be the problem

I am of the impression it was held together by carbon buildup