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What does the wideband say when you are breaking up under load?
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This will help us identify the issue. If the turbo is going bad... can you verify if its building boost?
Is the car running rich because there isn't enough air to accommodate the extra fuel under load?
Or is the car running lean due to a fuel issue (not sure if you have an updated fuel pump, but the SR will kill your +25 year old OEM pump after a while)?
Also, I should've mentioned this earlier, but you should probably change your oil considering water made its way all the way down into the spark plug cavity.