1996 E300D vacuum and tensioner issue

[Aquaticedge]

My Friend is working on a 96 E300D, One of the Vacuum lines came off the Vac pump and he does not where it goes, it's a clear line with no color stripes he says it's hooked to something on a fender, Drivers side, It's throwing Codes for the glow Circuit and Also a throttle/pedal position sensor,

The Idler Tensioner makes a Clattering sound from Idle-1300RPM, It's has a new shock on it but it rattles, It's not the timing chain is there anything that can cause this to rattle around?

Also, what can be throwing the codes for the Throttle position and Glow plug circuit?