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I don't know what was up with the first run where your A/F ratio "stuck" at 15:1. The sensor on the wideband O2 could have been fouled, or in need of changing. It's funny how the ratio changed in the next two runs. Was the power any different from run one compared to runs two and three? If not, I'd say you were getting inaccurate A/F readings. Just a heads up, if you see 15:1 again, get your foot out of the throttle, that's a recipe for a new engine. Plugged cats could create a great deal of backpressure, making it difficult to make boost, and create alot of heat in the process. You said' "my turbos were making boost", how much boost was it making? Take care, Mark
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