Yup, no reason to go backwards! The computer along with it's various sensors is what puts the tune into the computer controlled engines. Yes, it takes time to learn how these systems work and how to tune them. I was fortunate to be invited to spend a couple days with our local chassis dyno tune czar, learned a ton spending time with him and it removed the mystery of computer controlled engines! Lots of reference material available on line that deal with specific engines, just takes some research and study time. Once I learned the basics, the tuning and diagnostics got a lot easier. The information is all out there, most of it for free! Just last month a Ford GT went 300.4 mph in the Texas Mile competition, try that with a carb and a timing light!