Running lean.....high LTFT's at idle
 

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So.....has me a dilemma. 2002 Z28, LS1 M6. Only mods are SLP intake lid and SLP exhaust. Been getting a lot of lean pops on decel, and noticed my LTFT's are high positive. No codes or SES light. I did knock sensors over last summer, so thought it might be a vacuum leak. Sprayed everything 6 ways from Sunday....no change. Have not done any kind of fuel pressure tests yet however. Cleaned the MAF and changed the air filter to a standard one, as I believe the K&N oil may have contaminated the MAF. But what I *did* find when I unplugged the MAF......was the trims returned to normal. Am I barking up the right tree here in thinking I'm looking at a bad MAF? Attached are screenshots from my Tech2.....MAF plugged in, and unplugged.