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What does this hose do?

EGR won't cause a running issue. IF the EGR valve is stuck open the engine will probably stall at idle. These cars don't really have that problem. EGR just comes on at light throttle/cruise to lower NOX emissions.

I see a blow thru MAF, blow off valve, custom pipes, etc. If you rework the entire induction system and also put some different injectors in there, I would expect the car to run like crap. I have seen it tons of times over the decades here.
 
Its just running at 13.9 to 14 afr when it used to be 14.5-14.7....not a big deal just kinda random, I wouldn't say it runs crappy just a little rich...the thing rips otherwise
 
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