Arrr ok so , so you have had missfire issues on that number 6 BEFORE you did the clean on the valves , new plugs ...swapped coils around and still same .
Does engine loom from injectors and coil packs go direct to ecm or is there any big multi pin connector blocks on loom .
Is ecm under scuttle area ? Check for corrosion on pins at ecm .
Lamda trim levels normally effect full banks of cylinders , but simple test just disconnect pre cat lamdas and allow ecm to use its own richer default map then see if missfire count changes at all .
Buy a vac guage .... they have superb diagnostic qualitys , they give you an insight to what's happening in the intake side , I have one with extra long pipe so I can bring it into the car to watch what's happening with these strange missfire type issues
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