Car is hunting at idle, only slightly and intermittently. I just replaced the brake boost check vacuum check valve. The IMT o-rings have been replaced. Also I replaced the Lower & Upper intake manifold gaskets a couple months ago. The car is driving fine and then at a stop I can see the RPM gauge fluctuate very low then high. I suspect the Rubber sleeves where the vacuum lines go into the manifold are the culprit. What are the part# and names of these?

The lines are sliding up and down pretty easy inside of these "sleeves" so I assume the seals are worn. Also I put grease for now but the hunting is still intermittent, just not as bad.

 

After changing the brake vacuum line check valve, I assume the sleeve was worn and didn't create a strong enough seal.

Surely enough after spraying the seals with WD40, the car stumbled on idle from one of the sleeves.



I just need a part#. Thank you in advance.

 

The plastic piece that you can see is the portion of the connection that is used too release the line from the fitting. You press it towards the manifold and the tube will pull out. The seal is an o-ring inside the fitting.

take a look at this thread for more info about the fitting.
https://www.jaguarforums.com/forum/x...s15816-172307/

 

Thank you so much! The part # is C2S15816.