PPI have only told me basic things like yea need tires, washer fluid, wiper blades...I need to know much deeper issues..I don't do PPI anymore. When you already know what to look for these basics don't do much. Sending it to a whipple or performance shop to run a tune check is not PPI
Find the most local place that races cars and has a shop. I live in central IL and there isn’t shit around me, but there is one and those guys know what they’re talking about.
They will usually shoot you straight too. I went through four choices before I got one that passed their PPI. As always, your mileage may vary.