Jeep Liberty Random Misfire and Ticking

My daughters 2004 Liberty all of a sudden started running rough and motor began ticking
Check engine light now on, Had it towed home and a buddy hooked up his code reader that said random misfire. So I'm thinking bad plug or coil..... Replaced all 6 plugs and coils, she was low on oil so I added a qt. ticking not as bad but still pulling a random misfire code.
Any thoughts or suggestions?
Check engine light now on, Had it towed home and a buddy hooked up his code reader that said random misfire. So I'm thinking bad plug or coil..... Replaced all 6 plugs and coils, she was low on oil so I added a qt. ticking not as bad but still pulling a random misfire code.
Any thoughts or suggestions?
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