Why Is there air coming out of my oil cap?

What is your question?

So I just replaced my cam chain tensioner, and valve cover gasket. I put everything back together and started the car but now there is air coming out of my oil cap. But it never had that problem before So it was something I did. I have a 2001 Audi A4 1.8 T Quattro

What makes this problem better or worse?

I just started if for about 15 seconds and then shut it off when I noticed

How long has your 2001 Audi A4 Quattro had this problem?

Just yesterday