You forgot to connect your plumbing vent stacks to your waste lines. Now sewer gases are seeping through your sink drains and that is the bad odor you are smelling. It is also the reason you have poor drainage in your home.
I found this at my morning inspection today and had to share.
Plumbing vent stacks send sewer gases to the atmosphere and help drainage by allowing air and gravity to take waste from the home.
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