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Q: Mine looks cracked and brittle but It doesn't do it in warm temps. on 2000 Pontiac Grand Am

In cold under 10 degree mornings my car runs fine on highway then after I get off the highway the rpms drop and drop too low and sometimes stalls but mainly rough idle. Any ideas?
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The hose coming from the MAP sensor. And yes and all I got was a emissions malfunction code. I believe it was p0440
Would the MAP hose cause it to stall only after the car comes off highway or have a low idle?
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