Hello, I'm looking for some information, any help would be appreciated. I have a newly acquired mustang that the previous owner has started making some upgrades. I will tell you what I know, it has trick flow heads and roller rockers, long tube headers, explorer intake, a 75mm throttle body and I believe stock injectors and mass air. The issue I'm having is a stumble/surge from 1000-2000 rpm. I was told that installing bigger injectors, throttle body, and injectors would fix this, problem is I don't know what size I need on any of these, or if I need these at all? If anybody has any suggestions it would be a huge help. Thanks.