When I go to start my Jeep (87 Cherokee), fuel is leaking through the fuel injectors (not all, but some). They were dry for awhile and I'm wondering if that took its toll on things and now there's a leak. Can I just get the O-Rings and be set, or should I be getting all new injectors? And should I get both sets of O-Rings or just the ones toward the end that leaks? Thanks for any input!