Idle bouncing

[CR325IS]

I recently had an overhaul on my 88is and noticed when i come to a stop not everytime but sometimes my idle with the brake pressed starts to bounce out of control and lurches forward. It starts out slowly then speeds up the bouncing it is very weird and it is starting to piss me off. I recently replaced the coolant temp sensor and still does the same bs. I need some help. Also what is the normal idle rate while in park mine might be high idk. Someone help me out.

[IDM]

Idle control valve- have you checked it yet?

[CR325IS]

no ill take a look for cracks n shit but i dont think thats it considering it only bounces at when im stopped with the brake pressed.

[jlevie]

I would say that you probably have an intake leak in conjunction with a sticky ICV. If the bounce occurs only when you are holding the brake, there may be a leak in the brake booster as well as associated with the intake.

[CR325IS]

Would cleaning the icv help or what should i try first? You think the brake booster would have that much of an impact of the idle?

[CR325IS]

I just unhooked the ICV plug on the bottom while my car was running and nothing happened. Is that supposed to happen? Also I checked the black elbow that connect it to the engine I didnt see any cracks but im gonna look again. Anyone have any suggestions about how to check for cracks on this?

[CR325IS]

no1?

[CR325IS]

bump

[HST]

Clean it out!!!! spray the shit out of it with brake cleaner or MAF cleaner. You should be able to here the flappy thing inside move around freely.

[CR325IS]

Are u talking about the MAF or the ICV? I think my ICV is faulty if u unplug the connector on the bottom of it while ur car is idling what is suppressed to happen to a good one? Mine did nothing. Any explanations?

Clean it out!!!! spray the shit out of it with brake cleaner or MAF cleaner. You should be able to here the flappy thing inside move around freely.

[5KWattson]

Clean your iac valve, bouncing idle is from a sticky iac, usually

[CR325IS]

ok ill look into it but about me unplugging the connector to it and nothing happens...whats up with that

[CR325IS]

OK I took the IVC off and cleaned it with carb cleaner, and the little flap in there was flapping like said above. Time for a new one?

[CR325IS]

nothin?

[b*saint]

Did you check for a vacuum leak like everyone said? Sounds like a leaky bad brake booster.