Unless you have a tunable ECU you can't 'tune' the car...Only check/change things like ignition timing, s/plugs, coils, clean air flow meter, air filter, check compression etc...
All in all i'd be biting the bullet and taking it to a reliable mechanic to properly inspect the car and diagnose the problem. Its next to impossible to work out what a problem is without a trained pair of eyes seeing the car. Just because someone else had a hard to start problem doesnt mean its got anything in common with yours and its a waste of time guessing.