What mods were done to the engine? What kind of problems are you having? HP tuners can be difficult to learn, but can be done. The Gen3 ECM's are easier to tune than the Gen4. Most folks who tune with HP tuners, including me, will tell you that if you didn't buy a wideband O2 as well as HP tuners, that you might as well do that too. You really have to have the wideband readings to tune wide open throttle safely. You can tune regular driving without it though.