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This is old school stuff I remember for working with my neighbor who was a stock car racer.
If you pull a plug and nothing happens then it means that cylinder is dead, usually no spark or bad compression etc. The plugs tell the same story, they look rich. Why would the one bank be rich is the question, either it is over fed or the spark is not getting there. Sorry if you checked but is there spark? Personally I have had bad exp with the EXP or mutli tip plugs, ran horrible sent them back.
Check the spark and replace the plugs.
Cliff
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1972 911E w/3.0 RS Replica
1988 M5 300hp
2016 Audi Q5 TDI
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