Originally Posted by 1.8TTony
The missing hose at the rear corner of the intake manifold connects from that port then a 90* elbow sends it toward the drivers side of the intake manifold where it connects onto the MAP sensor.....in your video you can see the clip that is holding the three spark plug wires together. The clip is resting on top of the letters "SFI". Well if you look at the other spark plug wire clip, that clip is resting on the MAP sensor.
Wait....I'm mistaken....sorry, I didn't notice the year you identified your vehicle as.....in any case. That port can be capped off as you have it now....but I think it is supposed to have a hose connected to it leading into the passenger compartment to supply vacuum for the a/c heater vent controls.
The other port at the other end of the intake manifold....there is supposed to connect onto the transmission.
The noise you hear could be "piston-slap". Does the sound go away after the engine is fully up to operating temperature?