what connects to this?

[POOPmouth]

on the rb20det throttle body - on the bottom there is a vaccum hose- i dont have a hose on there - but i want to know were it goes

-- car is running rich and -- black smoke coming out of exhaust

[Carl H]

needs to be blocked off, it was for emissions.

[POOPmouth]

ic - now i checked my codes and i got a 54auto signal to ecu- ? i dont under stand - before it was throw 51 and 21 and 12 cuz i didtn have maf pluged in --54 - dont understand

54 Auto signal to ECU ?

that little vaccum line - looks like the ones for fuel but off throttle-will block tho

[POOPmouth]

another ? is that will this effect the drive of the car-is it safe- ?i notice i have a slight rev going on - so im going to look over IC piping - if that doesnt correct then im look into the timing -