Hi gents -- thanks for all the suggestions. I have been busy with guests all weekend, so the car has been on hold.

I get *occasional* fuel -- enough for the car to stumble for a second or two. The last few tries, I am not seeing any fuel at the injectors at all, and there's no stumbling either. There is fuel pressure coming into the distributor, but for whatever reason, none at the injectors. I have tried two distributors, for what it's worth, with the same results each time. I have so far replaced the idle control valve (the original issue was wandering idle), fuel pump assy, and fuel distributor.

Should the fuel pressure regulator hold a vacuum? I applied my mightyvac to it and it does NOT hold any vacuum.

Thanks all!

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1992 300D 2.5T
1980 Euro 300D (sadly, sold)
1998 Jetta TDI, 132K "Rudy"
1974 Triumph TR6
1999 Saab 9-5 wagon (wife's)