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Hello. I have a Silverado 1500 4.8L base model with 200K miles. I could use some guidance on how to troubleshoot two engine codes that my truck has. P0101 and P0171. I erased the codes, unfortunately. This is what I have done thus far: -Inspected the Air filter (it is clean) - Cleaned the MAF sensor with MAF cleaner. - The MAF values are responsive to changes in engine RPM. I don't have any special tools to check for vacuum leaks. I Took live readings with my Zurich ZR8 code reader The LTFT1 and LTFT2 hover around +14% when engine warm and idling around 600 RPM. Drove around a little and LTFT1 and 2 rose as high as 21%. MAP - 11 Hg MAF reads 0.52 lb/min TPS reads 9% Update 9/5/2021: I tested the fuel pressure and it is in the normal range, 58 while idling, a bit lower with the key in the "On" position. While running the engine, In short bursts, I sprayed brake cleaner around the air intake hoses and gasket and listened for changes in the idle pitch. Admittmedly, I may not have hit every crevice while doing this. No leaks detected. What are my next steps?