Its time. How? Replace gaskets? Soak in solution? Please give mucho information.

Get the gasket kit from the dealer. It'll have the orings for the intake side AND the fuel rail side. These fuel rail seals are critical......and they age rapidly. You don't want fuel leaking on the hot intake, eh?

Soak your injectors in fuel injector cleaner for an hour or so, then spray them off with more.

If you have the time to have them out of your car i would send them to get cleaned and or flow tested/ matched by a performance shop. I thinik going price may be $10-15/per a injector.