Have the dreaded “reduced engine power”
and “service stabilitrak.” Also throws codes p0532, p0507 and p0641 although not at the same time. I’ve replaced ECM, MTB, plugs, o2 sensors and still does it. Now I’m tracing all wirea
for a short etc., and ran across these hoses. Can anyone identify? I’m assuming some sort of vacuum hoses. Thanks!

 

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Looks like a vent hose to me. Probably for one of the axles. Need to mount it up high on the vehicle.