My 300D-T Just put new glow plugs in. Cold start:She fires right up runs smooth for about 5 seconds then rough for 20-30 seconds depending on ambient temps. Sometimes it take one or two tries to get her to run past the rough time. After about 30 seconds running she smoothes and runs fine. By the way she is a high mileage old steed.
Any idears? Should I just thank my lucky stars that she runs at all?

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Nothing in this world can take the place of persistence. Talent will not; nothing is more common than unsuccessful people with talent. Genius will not; unrewarded genius is almost a proverb. Education will not; the world is full of educated derelicts. Persistence and determination alone are omnipotent. The slogan "press on" has solved and always will solve the problems of the human race.
Calvin Coolidge (1872 - 1933)