Having misfires on 4,5,6 and tried several things. Runs great except when idilin

What is your question?

Runs great except when idling it cuts out and shakes. Any ideas? Also have headlight issue. Headlights will not go down to low beams and high beams work good. Checked several things. Changed out headlights from used car and not sure if that's the reason or if need to try something else or any ideas what to check?