1986 Volvo 240 fuel pressure regulator change
My 1986 Volvo 245 wagon was not idling right. It was like coughing at idle. I removed the vacuum hose and it had moisture and smelled like gas so it must have a ripped diaphragm and gasoline seeping in. That made the coughing effect. After the change, the engine movement calmed down. The fuel pressure regulator change solved a huge problem.