it has been a long time since i used my tunecu. there are so many others that know more that me on the tunecu. if u use the seargh system u should fine more than enough info.
basics buy cable on internet (search info for the correct cable) about $20 then download the free tunecu (u might have troubles on the windows 10.
like rick said make a copy of your original map. it was simple to go in there and look around before u start playing it.
for example i could see that my secondaries were restricted. most people just open them to 100% what i did was open them 100% above 3500.