2000 Hyundai Accent Replaced oxygen sensors, injector o-rin

Basically it is a rubber mount that absorbs vibration so the vibration isn't transfered from the engine to the frame; otherwise, you will feel it when your engine runs. Here is a picture of yours:

Let me know if this helps. joe

Orings made a difference. Unfortunate my choice of plugs was guided by the Auto "Kargens" and I chose Bosh, non gaping plugs. As in my Olds, they cause the engine to cycle in rotations. A mech. said I made the worng choice with my Ods., should have got OEM replacements. Opp! did it again. Check Egine lite came back on. Just can't figure out why this is occuring, as the car rund great. When turning on heater fax idel become ruff. Any suggest to fix it. I would like to pay if you know the answer. Honest! Love to chat about it.