I am new to the forum but in need of some advice/suggestions. I just completed a head rebuild/valve job on my 2004 S60 w/ the 2.4L naturally aspirated (ie, non-turbo) engine. Everything went back together great, but something still isn't right quite right. I think I've missed a plug or knocked a vacuum hose loose or something. I can start the engine-- it turns over fine and will run with the throttle open, but when I let off the gas pedal, the engine dies. It isn't throwing any codes and the check engine light isn't lit, so no hints there as to what is wrong.

There are fuel and pressure in the fuel rail (I checked the schrader valve on the left end), but I don't have a way to measure the pressure.
I've double-checked all of the coil and injector plugs and all are connected.

There is one small hose on the front right corner of the intake manifold that I am not sure I've got hooked up right. It's part 11 in this diagram:
https://www.volvopartswebstore.com/s...hrottle%20body

Where is that pressure sensor mounted?

Aside from that hose, any suggestions as to what else I may not have hooked up that could cause the engine to die? Or any recommendations on how to further troubleshoot the problem?

Thanks in advance!
-David.