My 98 454 has been fouling out plugs lately. It only does it when trying to start it. when I replace the plug it fires right up. It runs and takes gas fine no hesitation. Runs very well. It's got me stumped what would make it foul while trying to start. I've used cr6e plugs and they have fouled. I need to know how to lean the idel mixture or if there is a better plug out there?