Won't stay crunk, & won't take throttle. Goes back dead. See details below.

My fuel pump went out on my 2000 Cadillac Escalade. I changed it out as well as the fuel filter
and it ran for 1 1/2 days great. I went out to crank it after 3 days and it was doing the same thing as it was before I changed out the fuel pump. It will crank right up and shut right back off. I changed out the fuel pump & filter for the second time thinking that I may have gotten a faulty pump. It is still doing the same thing. Im getting good fuel pressure at the motor, and I checked my fuel lines up & down to make sure that im not getting air in them & that all looks good. My plugs & wires look fine also. When I prime it by pouring a little gas in the throttle body & it runs but when I try to give it throttle while priming it, it doesn't take it. It just goes back dead once I quit trickling gas in the throttle body. Can you help me out?