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If you don’t use a skinny socket, you may not have properly tightened the plugs. If you did not check the plug gap, it could be off. It is also possible you did not fully seat the coil. Whenever work is done and a new problem occurs after, I double check my work. A harness or connector could also have been disturbed, but it seems odd that would affect just #6.
If none of those, I would lean towards a coolant leak damage since 6 is on the tank side. The coils and plugs are new so I would lean towards the injector. You could certainly swap plug and coil from #6 to #5 first to see if the problem moves before focusing on the injector.
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