That hose in your picture is a power steering line. Coolant elbows take less than a hour to change and are only $4. If they are leaking try a little bit of rtv on it to see if it seals up better. To seafoam your engine pull the brake booster line and pour the seafoam into the vacuum line it'll clean it out. To clean the tb you'll have to pull your tb off and scrub it up really good.