donjetman
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I always have. aluminum heads, steel plugs. Dis-similar metal thing for me.
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Some plug companies are using anti stick technology to avoid plugs getting stuck in aluminum heads probably the reason some are debating. To be safe, steel will stick in aluminum and anti seize is a good idea to help avoid it. Does not take a lot, just a film on the threads and you are good to go. I would not consider putting steel plugs in aluminum heads without it. Steel plugs into cast iron heads, no issue.
No it's definitely been tuned to turn off AFM. My guy with the EFI Live tuner did not see any place where VVT is mentioned. He did say he thinks they call it camphasing, which he did disable. That's where we got with the tuning.You will need a tune to turn off codes for AFM and VVT.
If you have not turned off AFM in tune (?), that could be why it's not running right.