The car 94Roadmaster 5.7 80k miles been sitting 2 years started and ran fine for two days. The problem Went to start cranked but wouldn't start However put the throttle to the floor and it will start but you have to hold about half throttle to stay running but runs awful. If you let off the throttle it will die just as if you shut off the ignition.Put on a fuel pressure gauge . Turn on ignition and have 38# pressure. It will hold this pressure for 15 minuets at least. Then did the old school test opening the throttle body and giving a large shot of starting fluid. Turn the key but no attempt to fire.It seems the problem is not fuel but ignition but a full throttle it has spark. I hope someone has an idea/ Thanks in advance.