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Hi,

A post can only be edited either 'til someone answers it or for three days after it's posted, whichever is shorter; Kil answered so you can't edit your original post.

Afaik, NGK plugs with iridium centre electrodes perform similarly to ones with platinum or gold/palladium centre electrodes; i.e. they work better over a wider temperature range than more-common copper-centre-electrode plugs.

Given that property, and how hot it can become in Houston, I'd question the wisdom of using a 'hotter' plug heat range - e.g. "7" instead of "8" - especially when, as Kil posted, the problem you described in your first post is likely nothing to do with the plugs?

Hth.

Regards,