Engine tuning can be a difficult task to learn, without the right information. All engines need a precise balance of fuel, air, and timing in order to reach their full performance potential.  It is some of the key  instruction you need to learn for any modern engine rebuild. This manual takes basic engine tuning techniques to the next level. It is a valuable tool for tuners and calibrators and a great instructional resource for anyone who wants to make horsepower with a fuel-injected, electronically, EFI controlled engine.