Hey guys hope you can help. I have a 2002 gmc envoy I6. When changing spark plugs I happened to notice on the right side of my intake resonator box there was a little nipple there that I assumed should have something on it.. However there hasn't been since I've owned it about 3 months now.. From what I have found is that a air line goes from it to the fuel pressure regulator. Well on mine it comes from the fuel pressure regulator and hooks on a little nipple I have noticed on all others are just plugged off. I haven't noticed any rough running or idle or anything like that. I assume I should correct this and plug off that port like all others seem to be? I circled in red where its currently hooked to. That is the port that's normally plugged off. please help
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