Transmission

Hi when I start my car, first gear is not wanting to go to second. I have to rev it a lot to make it go to second or push the winter button then it will. All other gears work fine including reverse. It's an automatic 3.5 engine v6. There is also a air sound coming from engine like there is a hole or something somewhere. This all just happened when we changes alternator, spark plugs. Please help! Do u think its the transmission