Things to check:
When you installed the new plugs did you check the gap? Do you have the wires going to the correct position on the coil (A B) on the coil (G K) on the valve covers?
Did any of the coil pack connector plugs break? I have how to posts for the spark plugs & wires, also how to replace the coil plug connectors (New ones are available).
I can link those posts if you need them.