how important is this part(vacum related)

[Boone.Msi]

on the very back of the intake manifold (on the pcv plate) if you look from the drivers side there is a cap that caps off a nipple on the top left hand side of the pcv plate. its maybe 3/4" diameter. when i replaced my pcv plate it did not include this cap. so i put the cracked one on from the previous plate. could this be causing my idle problem? thanks, i will post a pic later tonight when i get off work.

[Rigmaster]

SOunds like it. Basically any crack or hole in the intake manifold is a vacuum leak and will cause idle problems.



Bret.

[MBXB]

Like this one?

http://thumb11.webshots.net/t/57/657/3/61/65/2978361650047009931WahcTw_th.jpg (http://community.webshots.com/album/555339883PhfFTU)

BMA has them. Replace that little vac hose that goes to the fuel pressure regulator too.






on the very back of the intake manifold (on the pcv plate) if you look from the drivers side there is a cap that caps off a nipple on the top left hand side of the pcv plate. its maybe 3/4" diameter. when i replaced my pcv plate it did not include this cap. so i put the cracked one on from the previous plate. could this be causing my idle problem? thanks, i will post a pic later tonight when i get off work.

[Boone.Msi]

Thats it! yea i replaced that vac hose.

i bought the pcv plate from bma... dosent make much sense it wasnt included.

[632 Regal]

get an appropriate sized hoze and plud it and stick it on, this should help.