I have done this easy fix from the forums.
Did this last week. Not that big a deal. Go to autozone and get 5 min plastic epoxy. Then dremel sand whatever to have a good surface to work with. Then mix up your epoxy and gobb that stuff over the hole n manifold and piece that broke. Use a drill bit of he appropriate size to hold pressure as it cures and keep the hole open. You can wait about 2.5 mi utes it should be setting enough to let off pressure. Then just keep drill bit moving to keep glue from plugging hole. I did this last week easy to fix if done right.