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Darn you beat me to the punch!:clap:

Hi Brian,
I had a quick look but thank you for taking to time to figure this out. I was hoping to find the iridium in a 6 heat range, and you figured it out for me!

OK update time.
I changed the fuel o Exxon 91 as Jamie suggested Costco 91 had quality issues as noted by others. The bottom line .... about the same.
This car is my summer daily.
Spark plug...

Thanks Johny, yes I do have this but perhaps I should test it is tight The NGK GR4IX does fix the issue

Thanks Guys
Plugs are cheap so I will try 'em

I believe the timing and cam are fine but I will check when things quiet down a bit here at home. Where can I check the heat ratings on the plugs vs others? I searched but did not find this cross...

Yes the irdium plug has a narrow electrode

Hello All,
using Costco 91 fuel in Ontario
my 87 CSX with 2.5 TII, stock garrett with two piece and mildly ported head. FMIC worked well on stock type spark plug (Autolite 65)
After a engine...