jesus, how the heck you could replace just a part of the CCV system without tearing the rest of it to shreds since it's all bacon by this point anyway in your 1999 is beyond me.
I had the yellow "goo" appear a few times in my car under the oil cap. It comes from running the car around town and not really letting her warm up fully. If you do a lot of around town driving, then get her out on the highway and run her for a good long time. Hour or more, or a road trip even better! You should notice the yellow goo going away under the oil cap. But please don't ignore the rest of the ccv system, you should really replace it all as soon as you can, you may have cracked another hose replacing that one you already did or the separator, they are so so so so brittle, which is why most DIY's tell you to just break it apart in your hands when removing it rather than try to remove it the way it was connected.