last year my 2005 toyota avalon check engine light came on.code#p0303.plugs and

What is your question?

#3 coil was replaced.After repairs car ran very good,after about 10k the same thing happened check engine light came on code#p0303.The same repairs were made #3 coil and plugs.Again after a few week the light is on Code p0303.What is realy going on wiht this car anyone know ?Please anyone experience this let me know thanks.