F150online Forums - Another P1074 case eventually P1071 too. but it's not the elbow

I've been trying to track this problem down for about a year. From searching on this board I've checked all the usual. elbow in back of intake, pcv valve, cleaned maf, sprayed flammable cleaner around, anything I missed? I love boards like this, very helpful if you know what to and how to search.

After doing all this, I still get the code. I didn't replace any hoses or ends as they seem very flexible and I couldn't find any visible holes in the ones I had off. I have a laptop logger that can pull all kinds of values and codes, reset CEL/MIL etc. The only thing that I notice odd is... it don't take much throttle for the short trims to go full max at 25%. Other than that I hooked up a vaccuum hand pump to the line that goes to the evap and can't build a vaccum. Do I need to tee into it or can I just hook the end up to the pump (which is what I did) There was air leaking from somewhere as I could hear it. Not a hissing air... more like a valve that couldn't stay closed...think fart like:o .. hard to explain noises through words.

I got my automotive stethoscope and tracked it down to a part that looks like the one in the pic attached that I've colored (badly I might add) red. What is this part and should it act this way? I'm pretty sure it shouldn't. I can here the same noise immediately after turning the truck off.

Condition that light comes on is usually moderate acceleration/load. I can reset the light and as long as it's cold out it stays off (didn't have any trouble with it all winter) even when hauling a load of green wood for my outdoor burner. As soon as it warms up enough outside and my wife's foot is heavy enough;) the light comes on. If I stay out of the throttle as much as possible I can usually keep the light off for as long as I like.