I ended up finding a post where somebody was having a similar problem that I was and one of the top comments on that post a guy had said word for word "I hope you don't have Bosch Platinum plugs in there." I ordered NGK ZFR5N copper plugs. I just received them this morning and got work. Gapped them to 0.035. Put them in. Done. Misfire gone. Runs perfect idles like butter.
at 100k km, I replaced (all Bosch) Plugs , Coils, starter, battery, voltage regulator (40).
So new Bosch plugs and red-top coils seemed worth the $109. Old spark plugs were pretty crusty, which made me feel better about doing it.
FWIW, if you don't have Bosch, BERU, Bremi, or NGK plugs/coils and have store brand stuff, I stop diagnostic work until you get OE grade stuff put in there. BMW's don't like the Zone/ebay for ignition parts in my experience.
Yeah can go wrong with acdelco. I run Bosch in my 93 4.3
I've run Bosch iridium's in all my vehicles (boosted and daily). No gapping needed.
But otherwise, Bosch FLR8LDCU+.
In my experience, Bosch spark plugs are always terrible; fouling out within a month, that kind of thing...
Worst case of electrode wear I've seen was on a set of Bosch 3-electrode plugs in a VR6. Plugs were so far gone, that five of six had triangular shaped center electrodes. Really thought I was gonna gall the head threads they'd been in so long.
I found Bosch platinum plugs misfired intermittently on GM v8s with the optispark distributor despite being identical to the Delcos.
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