my 93 gmc starts but dies immediatley!!!
 

I have a 93 gmc Z71 with 203,000 miles on it. It has a 350 and when I start it, it cuts out after a few seconds. I have changed icm already because that was the problem last time. I changed the fuel pump and sending unit along with fuel filter 2 months ago. I don't have a mass airflow sensor on it. Not sure if it could be fuel pump relay or what!! I am definately stumped. Pick up coil has been replaced also. I don't think the fuel pump is bad because it would usually just quit and give it no gas. That would be my luck though!! help me out with this one please!!!!! [:@]