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Re: Code P0174 &P0171 65 miles after LS Swap installed.
That looks to be "Freeze Frame" data (Though not familiar with that scan tool), Its shows what the data stream was reading when a code trips.
+25% on both LTFT's will set those two codes.
Access the Live Data & unplug the MAF & watch LTFT's.
Intake Vacuum leaks are easier to prove out with the engine cold, Check with carb cleaner on the first start of day.
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