Is your AFM sensor actually working? The lex and 550's don't make it run rich by themselves. Find out what isn't working i.e. codes and work from there.
I've used autolites with no problems and I like NGK coppers also. Platinum doesn't ever seen to make much of a difference to me. Just never use Bosch, ever.
I wish I knew. I assume in the 14's somewhere. I gotta go run, my friend hit a 14.4 with my exact setup and my parts. I'll find out for sure when I rebuild hoping 13's then :evil2:
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