Misfire code on C7 only at sustained HWY Spds 60 mph? No adverse pwr fluctuation on 2007 Chevrolet Trailblazer SS

This happens after driving 60 mph for 30 minutes or longer. There is no adverse power fluctuations.

Asked by for the 2007 Chevrolet Trailblazer SS
1 answer
Upper induction service should do it.