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I'm having the same problem, always have to turn on ac and put it on auto so it doesn't get warn. My car has 47k miles, are cats clogged with that mileage?
Possibly clogged cats if it's coming from the floor board?
its funny you say that because when I start the car on mornings, the thing sounds like a desil truck. I thought maybe an exhaust leak but after putting it up on a lift and checking there wasnt any. I would look into changing the cats since I have a couple of them laying around. Thanks for the info.