2016 Silverado 5.3, Whipple 2.9. Truck has run fine in the past but has developed a little unsteadiness at low rpms. I don’t believe it’s tune related and have tried what I know to do including sending it to a reputable general auto repair place. No luck. Looking for a place that’s good in diagnostics. Any suggestions are appreciated. I would even send it to a GM place if that was the best option.