I don't know the 3VF FE6. If it is similar to the 2VZ FE you have two BVSVs next to each other. These each have two vacuum hoses. I don't know what color these are or if these are what you are describing or not. One helps to control the EGR valve and the other helps regulate the EVAP (charcoal canister) system. Since you don't notice a great deal of difference I suspect that it is the one for the EVAP system. Trace one of the vacuum lines to the charcoal canister and it's probably the one. A picture would be helpful.
Someone may chime in with the part number. You should be able to track a used one down. eBay is always a good source but you never know how good it is.
Kep
Someone may chime in with the part number. You should be able to track a used one down. eBay is always a good source but you never know how good it is.
Kep