missing link...are you using a FMU too?
If so, ditch them both. In a 94 Integra your best bet is to atleast run some tuning software (Crome) so you don't have to deal with the failing mechanical "bandaids" (missing links and such)
As stated, your CEL is coming on when your map picks up on boost. You can use a missing link (if you insist on having one) or you can use some inline check valves to bleed the boost off before the map sensor.
BOV not working= probable boost leak somewhere.