If there are leaks, find the cause. Most likely, you damaged the seal and it needs to be replaced with a new one.
As you can see, replacing an old kitchen faucet with a new one is a simple procedure. The main thing is to follow the instructions and use high-quality plumbing materials. https://famenest.com/post/248674_https-www-scribd-com-document-832872622-pvc-pipes-and-plumbing-https-famenest-co.html