I second the above. The fuel pressure regulators go bad on these cars. Mine was over fuelling and wouldn’t idle and it turned out the regulator was leaking a small amount of fuel into the air line to the intake manifold and unmetered fuel was causing it to run too rich. If you take the air line off the regulator and fuel comes out that’s your culprit.

Even if it’s not your problem change the regulator anyway if it’s never been changed as when they leak they drop petrol onto the dizzy below and I’m sure you can imagine the result!