question:you now the black box under the intake minufold on a 1991 b18b
and how there are 2 posts on the top one hose goes up the middle of the manifoldand were does the other post go to because when i put my finger over it theres air blowing out of it but no extra hose

it causes my car to idl real low and sometimes turn off,but when the temp gauge is half way up it runs fine

please help asap thanks!!!!!!!!!!!!!