My 1980 450SL starts and idles great when it’s cold. As soon as the engine warms up it dies. It will start and run as long as I keep my foot on the accelerator. As soon as I take my foot off it dies again. It seems to be trying to idle below 500 RPM when it gets warm. I have changed the fuel pump, fuel filter, and all the vacuum lines that I know of. Other than that this car has been sitting since 2014. What would cause this issue? Could it be the accumulator?