will start for 1sec then will die. HELP me please..

I got a honda odyssey with 130Ks will start for 1sec and will die. even will press the gas and pump it, will just start for 1sec and dies again.and theres a time will start perfectly for 2-3 days after sometime will do that again. just chaged the oil, plugs, water, air filter is good. and still doing that. please help me.