Put a new faucet in and when I turn it off, it will run for a little while before it shuts off.
Should I take it back?

Hi Betty

I would disassemble the faucet and clear the valve body of any sediment/debris that may have come loose when you used the shut off valves under the sink.

Here, remove the cartridge assembly indie the faucet and then put a towel over the top of the valve and quickly pulse hot and cold water on to clear the lines. Inspect the cartridge for any sediment and then reassemble. If that fails to resolve the issue then you either call the tech. services of the manufacturer or you return the faucet.

Good luck!

Mark