engine noise

[hitman3]

i have changed oil today with plugs and some vacuum pipes i use 10w-40w oil semi synthetic suddenly i hear nuking noise on low rev also does any one know were the vacuum pipe connected in the engine the one coming from the gear box

[Danglerb]

Knocking sound?

Whats the history on the car?

[vdubr928]

Huh?

Are you talking about the vacuume line from the trans? If so it is the metal one off the front of the intake.