I doubt that the vent got clogged at the same exact time I replaced the engine, but I'll check anyway. As far as checking the timing I haven't found any good DIYs for that.. is it something I could do myself? Also could you expand on the timing device not advancing hypothesis? - I'm not sure I understand how that exactly works.

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1987 300TD, 200,000 miles - Nice upgrade from my old
Blue '80 300TD, which is still runnin like a champ on WVO - 450,000 miles.