I'd replace them immediately, you'll notice an improvement right away.
You will have improved power and fuel efficiency if you replace those plugs.
It was the plugs all along. No wonder though, since they were extremely overdue for replacement. Checked the gap on every one i pulled out. They ranged from .037 to .048... so there must have been some severe blowby, hence the misfiring under boost.
Bosch F3cs @27psi no issues and no gapping
I also suggest NGK spark plugs. And not necessarily the high-end Iridium ones. The 'lower' end ones are just as good.
I personally run 0.035" on BKR7E-IX plugs and the red 06E coils. Significant improvements to acceleration and responsiveness after the ECU adapted :thumbup:
When I got the car back from the shop I installed a wide-band O2 and changed the plugs to NGKBKR7e's (Copper) gapped to 0.028. I also re-greased the DV, since last time I had used generic grease general purpose grease, with high temp grease. The car feels a lot better now, and timing pull ranges from 3-8 under WOT. The AFR gauge shows anywhere from 12.5-13.0 under WOT, and bounces between 14.3-15.2 or so while cruising. I also believe that I hear the DV a bit more (have a cone intake), so maybe it was sticking?
I pulled the plugs this morning and replaced them with Bosch cooper plugs, the only match that was available in local Autozone. There are no more misfires (for now), which makes plugs the culprit.
But otherwise, Bosch FLR8LDCU+.
NGK Iridiums.... Not right for the ABA, and really a waste of money unless you are running a hopped up ignition, anyway.
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