Fuel pressure regulator is a good possibility. Disconnect the vacuum hose and see if it is wet with fuel or smells of fuel. If it is, the diaphragm is blown.
That is assuming, of course, that all of the ignition (timing, etc) and fuel filter have been checked or replaced.
Answers
Disconnect the vacuum hose and see if it is wet with fuel or smells of fuel.
If it is, the diaphragm is blown.
That is assuming, of course, that all of the ignition (timing, etc) and fuel filter have been checked or replaced.