I started with plugs and coil packs. I ordered oem plugs and z1 coil packs off of their website and had my mechanic throw them on for me.
Wouldn't you know, the spark plugs were "the worst he's ever seen."
I bought and installed supposedly OEM spark plugs from ebay about 5 years and 50k miles ago but I remember them being suspiciously cheap at the time...hmm
Car is running noticeably better and the dash light hasn't come back so far!
Thank you everyone for the help / advice! I'm hoping this solves it. I did some fuel system cleaner as well while I was thinking of it.
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