engine check light was on from san Francisco to los angeles, ca.

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sears auto center, Glendale ca. replaced 6 coils, light came back on the way back to s.f. sears reset codes was told to take it back to Honda, took it to Honda garage, was told #5 is misfiring, told them all 6 coils were replaced, Honda replaced #5, light still goes on, now, Honda has to adjust valves, what gives? please help...