Sounds like quite a mess - dirty fuel doesn't do any injection component a favor - here's what I'd do ... (for whatever that's worth).
1) replace the filter
2) remove the lines from the fuel distributor to the injectors at the injector end - place them in a PLASTIC container and turn on the fuel pump - carefully pull up on the airflow plate with pliers to get fuel through the distributor - this should pump most of the crap out of the fuel distributor.
3) remove the lines from the fuel distributor - clean them out with spray injector cleaner
4) remove the injectors - spray some injector cleaner through them
5) using FRESH COPPER CRUSH WASHERS put everything back together
6) start car - check for leaks - drive away
Remember - you're working with gasoline here - so it's really dangerous - watch for sparks (no smoking!) and keep a fire extinguisher handy - work outside (ventilation and - if a fire does start it'll just be your car - not your home - that burns up) and dispose of filthy gas properly (lawn mowers tolerate bad gas pretty well if you filter it through an old "T" shirt).
If you're not comfortable with the procedure then I suggest you take it to a pro and let them know what you want done. A Bentley manual for your car would be a really handy thing to have for this and other procedures, by the way.
Best of luck
Steve
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