Do bad spark plug hurt my gaz milage ?
I install ngk sparg plug last summer and didn't change a thing since I get it out of the garage this year.
Is it a good thing to change them each begining of season and will it help on the gaz millage ?
Thanks
I install ngk sparg plug last summer and didn't change a thing since I get it out of the garage this year.
Is it a good thing to change them each begining of season and will it help on the gaz millage ?
Thanks