Hello all,

Here's a question that a mechanic I went to forgot/didn't know how to address.

My car sounds like it's always cold while driving now, even when it's not.

When I start my car, I of course let the idle drop before driving off. On the rare occasion that I don't wait and drive while it's still a little cold, the engine sounds..loud. It has a sort of loud whoosh/roar. I'm not exactly sure how to describe it. I mostly hear it in first gear, ascending with RPMs, getting louder as I accelerate SLOWLY.

I just got my car back from some repairs..I think it's been sitting a while. Now, when I drive, it's always sounding like it's cold in this manner. It idles very smoothly. Any ideas what it could be?