My car has been running puke-rich so my spark plugs are all fouled. I'm replacing the fuel pressure regulator to cure that problem, but I'm wondering what plugs would be best. Mainly, do those Bosch Platinum +2 and +4 plugs have any real advantage? Price isn't a huge issue because Santa gave me an Autozone gift card, but I want to get the best for my money obviously.

Thanks for the help!