Update: plugs were real bad and the wires marginal so I changed them and the upper manifold gasket. After 20 miles got the same codes. Idle is still not smooth. Looking down the cyl 5 spark plug hole I can see that the top of the piston is wet, cyl 6 looks dry. Tomorrow I will swap cyl 5 on the coil with its mate and see if the problem follows the coil position. I will also check better for vacuum leaks. |