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I know this isn't gonna help but here goes
Isolated bank 1 misfires confuse me. There aren't any vacuum lines that are isolated to that intake runner. Everything runs to either before the TB or the back side.of bank 2 (where the brake booster line, fuel pressure regulator, and flapper valve attachment are located).
You said you checked the plenum boots - what about the crossover pipe boots? There could be a crack in that.
Did you recently work on the injectors? Maybe one isn't seated properly.
I can't imagine how the runner gasket has gone bad, but I understand your logic though.
Simple thought but have you cleaned your maf recently?
Also, did you get your o2 sensors plugged up properly?
Sent from my SM-G970U1 using Tapatalk
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
Last edited by ike84; 07-17-2021 at 09:08 PM.
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