P1120

So I decided to change my spark plugs after 145K. Was running great but I thought I get better gas mileage with new plugs. No problems changing the plugs but saw the throttle body was dirty....took it off and cleaned it. Put everything back together and presto.....a code P1120, engine missing, reduced engine power light on. Says it is a fuel and air metering problem. I double checked all hoses and the only thing I could find was a plastic nipple with no hose attached just to the right of the very front spark plug. Couldn't find a hose anywhere near it to attach. Any suggestions??

There is a thin plastic tube with a connector, just keep looking.

There is a thin plastic tube with a connector, just keep looking.

Where does the other end go to/connect?