99 yukon start then die out

my 99 yukon start for 3-5 sec then die out. when my car die out the security light blink. I have three people come and diagnosis it they say everything is okay but can't find out want going on with my car .... it's not the pass lock 2 .... when i spray the carburetor choke into the carburetor my car run.. I'm trying to find out what make the fuel disabled on my car... now i took it to a auto electric shop they think it the ecm brain but not for sure.....does anyone ever have a problem like mine?................