car wont start. help..

[drft@110]

i have a 92' 240sx coupe with a sr swap. when i try to start the car it wont catch until 3 to 4 tries, and when it starts it shuts off after 10 seconds of running, and when i give it gas it dies and wont start for a while. could it be the vac. lines, timing, ecu, or electrical. any help would be appriciated. thank you

[Chukidori]

All vacuum lines are connected to the intake? Have you checked the maf? Check that your injectors arent leaking? Check all your plugs to see if they are fuel fouled.

Check all the obvious **** like that.