HELP! Our 350 truck has always gone through periods of not wanting to run. We bought it new in 73 and it only has 88k miles. A Chevy dealership in about 75 said we needed a fuel pump....no I had just tried that. They insisted, put on the pump and called me to come get my truck. They called back in 5 minutes, "never mind it quit running." That time it turned out the dual tank system hoses were old and would collapse like a straw, preventing gas to pass. For about two years now the right side tank would not give gas to the engine, so I just used the left side. 3 months ago I had all the hoses changed, except the vent hoses on top. The other day she quit running on the fwy in the dark. Scary to say the least. So now if I spray starter fluid in the carb it fires right up...then dies. Anyone have some suggestions? Oh, it has a new gas filter and electronic ignition. I also thought vapor lock, but it has set for 24 hrs now and nothing.