The engine will suck in as much air as it can get, and the EHA will try to compensate with fuel when the O2 sensor says you're leaning out, even if the AFM doesn't see the air leak. So, yes, you have an air leak. Replace the hose, and any others that have dried out in the idle circuit, and the lower AFM plenum as well would not hurt.

Steve

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'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7