IT WONT START

[twiztidkilla]

i have a 1990 240sx coupe... with the KA engine in it... and i recently put new timing and exhaust valves in it...... everything is on... timing, the distributer..... wires are on right, everthings hooked up... but the problem is now.. when i turn it over to start it, it runs for maby 3 seconds then dies then wont try to start again... after i leave it alown for a little while it will start again for about 3 seconds then nothing... weve triple checked everything... and i dont know what is going on.. can someone help.... its frustrating me...

[Nismo31]

intake on rite? check the o2 sensor which is on your header as well.

[twiztidkilla]

yeah everythings exact...intakes on right and torqued to specs.. O2 pluged in and ready... its really confusing me... all the fuses are good... i tried alot of things.. thought i had the gas lines on wrong... nope, its just beyond me at this point