Valve location that leads into the manifold

[Black 97SE]

My brother and I are going to use some sort of engine cleaning treatment, but we couldn't figure out which valve lead into the manifold. Would anybody know specifically where the valve is located that leads into the manifold for when you'd use the product "seafoam"? THanks

[los_inc]

brake booster hose it connects to the brake booster on the left near the bottom of the brake booster or the AiCV. it's the vacuum hose under the throttle body
you should have searched there have been plenty of threads on seafoam and ways of gettting it into your air/fuel system if worse comes to worse just pour some in your gastank.