engine wont start

[Raas_s12]

hi every one....... i am new to this and i wanna get things right i have been told that i can get help here well here goes

i bought a s12 1989 shape and it was misfiring........it has mods such as t28 turbo front mount intercooler a fifth injector

now when i bought it the engine would misfire very badly and me like a geniuse drove it for 117 miles

the car then died out and would not start i have changed the battery new plugs new ht leads and still nothing

i need help big time to get my car started any ideas........?