[Cooldbz12]

dang that sounds ugly. my guess would be a lifter. Get a plastic pipe or a cardboard roll from used up paper towels and put it to your ear while moving the other end against the valve covers or any other suspected source, and you will find where its coming from. I dont think changing the spark plugs would do a thing. Check your oil level. Check your pulleys too, could be something rubbing kinda like a baseball card on a bike wheel affect.