Any car sitting for so long must follow a process to get it going... even if stabiliser was added three years ago...
Do a visual inspection of all the wiring within the vehicle (look for vermin having chewed on things they shouldn't have).
Check battery condition or simply replace it if you haven't maintained it while in storgae.
Check all electrics operate (windows, door locks, radio, can check ecu codes, etc... gives a good idea if all seems ok).
Check tank (look inside) and flush clean any gunk, crud, sediment, etc (this could be a big job),
Check fuel pump and filter condition and repair/replace as required.
Check fuel lines for blockages and/or restrictions and resolve as appropriate.
Remove injectors and check their operation and spray pattern (off car), flush/clean & replace orings.
If all seems well, then and only then does one try and start it...
Wouldn't be the first time someone has spent ages and $$ on parts trying to get things working only to find chew marks on criticall injector or sensor wiring..