Attaching tune file. 2009 Silverado stock 5.3 walbro 450 pump, E85, Fic 80lb. injectors. twin 50mm turbos @ 10 psi. Surges at idle, and transition from drive to park or neutral. Sometimes dies when changing from drive or reverse to park or neutral. Long term fuel trims turned off in tune. Running stock MAF and MAP sensor.
Logs would be helpful and you really need a 2 bar MAP sensor to correctly tune for boost. Tuning just the MAF will not help you with transient fueling nor can you log boost without the 2 bar MAP in your scans.
2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.
If you don't post your tune and logs when you have questions you aren't helping yourself.
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