Olivia

My Ford Fusion will start, and will go into any gear, however after it idles for a moment it will not move, I can press the gas all the way down and you can hear it trying to move but it stays completely still. I have done a transmission fluid change and that did nothing. It also starts whining as soon as it starts. I just need to know if anyone knows anything before I spend money I don’t have to get a new transmission.