my daily driver is driving me nuts,after i tuned it,has 105,000 on it,keep getting a cyl. 6 misfire code,new coils,wires plugs,fuel filter,car runs a lot better just a rough shakey idle,ran sea foam thru the engine,and the fuel tank,but it keeps throwing this code,im going to check the egr ports for any carbon buildup in there,any other idears,thanx