A bad fuel accumulator usually causes problems for warm starts, not cold starts. Have you ever replaced your fuel check valves? They should be preventing the fuel running back into the tank and if they malfunction then your fuel line may be out of fuel.
Have you checked the O2 sensor? I had a long crank and a rough idle until 60c. Replacing the O2 sensor worked for me.
The fuel distributor is over $1,000. I would need serious proof before replacing it.
1989 420 SEL