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It's unusual to have misfires on only cylinder 1 and 8. Normally when we see timing issues they affect one bank at a time. Since that is the case I would probably suspect a fuel injector issue rather than a timing issue.
Also, have you already ruled out an exhaust restriction? No lean or rich codes are stored during the misfire right?
Strange. Do you have a scan tool to monitor fuel trims while the vehicle is running?
You shouldn't see more than 10 plus or minus on either bank of the engine for more than a few seconds. If the computer runs positive higher than 10 for more than a few seconds that means it is running lean. If it runs at -10 or lower for more than a few seconds then the system is rich. A rich condition means an injector is leaking or a spark plug is not burning all the way. A lean condition means the injector isn't firing or there is an air leak somewhere.
This number looks a little weird:
99.2% fuel trim on bank 2 means that the computer thinks bank 2 is running really lean. I would suspect either a faulty oxygen sensor on bank 2 or a dead fuel injector.
Probably injector #8 since that is the one that keeps misfiring. You might swap it with another cylinder or just replace it and see what kind of numbers come up.