I have been trying to get my fathers Chevy 1500 Vortec V6 running. It's a 1996 with about 55,000 miles on it. The problem is it will turn over fine but acts like it is not getting fuel. So far I have put in new plugs, new fuel filter, new air cleaner. It will start right up and stay running fine with a shot of ether to the air intake. What am I missing?