sparkless #6+#7

hello.
my car is 1999 cadillac seville sls 4.6
my car have 4ea ignition-coilpack and icm

problems
- #6+#7 spark-wire have no spark
- maybe.. spark-wires and spark-plug are good
spark-wire arrangement is good ( 6-7 4-1 8-3 2-5)
- i tried to replace coilpack with another coilpack,
but #6+#7 spark-wire have not sparks yet
- dtc have only p0300 code
- need more inform?

please help me

thank you.