Ok, So this started about a month ago and I'm starting to get scared it may be a big problem. It usually happens at night when the car hasn't been driven for a few or more hours. I notice that right when I start driving, the car is not picking up like it is supposed to, The engine is revving up normally, but the car is moving very slowly. It feels like the transmission is slipping, but I don't think it is that because it happens in different gears, and only happens for the first roughly 10 seconds of driving. So I don't know what it could be, I don't think it is the engine because it revs up normally, I don't think it is the transmission because it is in multiple gears, could it be between where the transmission/engine transfer the power to the axle ? Bear with me as I don't fully understand how everything works. Also I thought I should mention I changed my transmission fluid not too long ago. I checked the level though and it is still full. Any help is greatly appreciated, or if you have any questions to better understand the problem in order to help, just ask. Thanks.