I have a 1973 Camper Special 3/4 Ton with a 350. While driving today when I was stopped at a light or stop sign and took my foot off the gas, the engine would stall. After a few minutes I was able to get it going again. Even when in park or reverse the engine sputters and eventually dies. It drives fine but as soon as I take my foot off the gas it wants to sputter and die. Any ideas of what this could be? Clean the EGR? Faulty Fuel Pump? Clean the throttle body? Any help is appreciated. Thank you.