i got codes 73 and 74. randdom misfires on cylander 3 and 4.

anything i can check.

i took spark plugs out and 1,2,3 look good, and 4 look a little black. these are brand new plugs so something is wrong.

this is a fresh rebuild on engine has about 15 - 25 miles on it.

platinum.

 

How old are the plug wires ? You could do little things like clean the cap out or buy a new cap and rotor. Or if you have another set of plug wires around you could try changing them. How old is your cap and rotor ?

 

i regapped them at .028 and all is well.

thanks.