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Had the same issue and turned out to be plugs. I would start with that again and see what happens. Then move to coils and then injectors. It's good that you did walnut blast it as the carbon build up on the valves( infamous problem with direct injection vehicles) as it will cause the vehicle to run sluggish and in some cases misfires. Sounds to me like you may have a bad coil or injector or hopefully not both. Good luck with the issue man I hope it's just the coil(s) for your wallets sake.
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