CHECK ENGINE LIGT CAME ON - CODE P0306

howdy folks, lil while ago check engine light came on so hooked up the OBD and got the P0306 meaning the 6 cylinder aint not doing it job and firing

just changed spark plugs, still the same, so guessing coil, is there any tricks anyone knows about the coils, maybe certain wire connection to look at or good way to clean the spring, anything... or is it just time to order new coil?

cheers,
disco

 

i just tested coil its good, anyone have any ideason this one?

cheers,
disco

 

diag says cylinder 6 not firing, just tested coil and new iridium plug both good, but since light come on i got....

(see pic)


this is not a hard I-10 run, this is just from smaller state roads like running at 45-65mph

(drinking gas!)



i restart trip odometer every fill up....


cheers,
disco