Hard starting

My 83 300d starts hard and smokes, a month ago it started so easy. Now that I sold it the people are having trouble with it, did I get some bad fuel or are the injectors bad, how about the glow plugs. We check continuity on each glow plug and they check out okay.
I feel very blessed that I got my $4500.00 out of the car, plus a parts car, now I want the new owners to be satisfied too.
My nephew wasn't much help either, he is a GM man and doesn't know much about anything else. Quite selfish the ol boy!

[Larry Delor]

I would wonder if there was any algae in the tank, and then I would go out and buy a bottle of Diesel Fuel Catalyst from Redline, and see what happens next. (I think they sell it here too) I usually dump in a whole bottle, and then follow the increments on the bottle for daily fillups.
-Larry

[unkl300d]

redline and diesel purge...
get ye to partsshop!
then go fetch a pizza via
italian tune up road

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1979 300D
133K miles
1989 300SE
1995 C280

Thanks everyone for your repleis.