My truck started idling hard, and when I parked it I noticed the drivers side of the engine was wet and that this hose had fallen against the engine. I assume it melted (though I can't find a hole with my eyes...) and spilled on the engine, but cannot find what the hose carries or what it is. It seems to connect to a small line or sensor on the passenger side and on the drivers side it goes somewhere with several other lines near the fuse box.

97 PSD.

Thanks guys.

See the attached picture. At this site:

What is this hose? - PowerStrokeNation : Ford Powerstroke Diesel Forum

 

Need to be a member there to open the pic. Sound like the vacuum pump line though

 

not only do you need to be a member to see the picture, but the picture is so damn small you cant see anything in it anyway.