Code P0174 &P0171 65 miles after LS Swap installed.

[Nodnarb76]

Originally Posted by clinebarger

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.

Good idea. Will try that tomorrow morning. Thank you for the help.