I can't remember, but I'm sure they could stand changing. I just wanted to make sure it wasn't d/t the fuel sending unit, which I just changed, or the EGR I just took out and cleaned. Those three codes ( 1 for the FSU and 2 for the EGR) were the only ones that came up when I had it read. You're probably right. Today I had no cel at all, but yesterday it was flashing upon accelleration. Now that I think of it, it did feel a bit "chuggy" yesterday. I'll go ahead and change the plugs. Can't hurt. Thanks for all your help.