Air escaping from tires, could be bad? Options

[funnyboy117]

I was turning left on my 2-3 week old wheels and tires today when I noticed a sounds coming from the right front fender of my car. I thought it was the tire rubbing against the fender, but it only happened once every time the tire revolved. When I got home I had my car parked and I moved the wheel back and forth, and I heard the same sound while the wheels were moving against the ground.

I went out and checked, pushing on the tire or looking for a place it might rub, but I couldn't find anything. But when I tugged gently on the tire, pulling it slightly away from the rim, a small spurt of air came out. At first I thought oh ****, another flat tire, but as I kept letting air out, the tire wasn't losing any pressure, and eventually, no more air came out. I have no idea what the problem is.

My hopethesis: When the tire was mounted, somehow some air was trapped inside and now has to escape, which means the problem will go away now. However, if the same thing happens when I drive tomorrow, then I am horribly wrong and possibly in danger. Does anyone have any idea what this is?

It might help to know that my wheels haven't been aligned since I got the new wheels and tires, moving up from stock to 18", and there has been an ever-so-slight pull to the left.

If anyone has any clue of what could cause this, please let me know.