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Ignore the 3-2-1 code... 700 1990

...it's a known condition resulting from a wiring change to the cold start valve.

Hate to say it, but your symptoms sound like an end-of-life Regina Fuel pump. This is based on two recent threads here, one by Art Benstein. I can't recall the other one, but he chased it for a long time.

Just googled regina pump benstein and found the other thread from Haroon here, with Art's comments and a link to his pump replacement photo sequence.
--
Bruce Young
'93 940-NA (current), 240s (one V8), 140s, 122s, since '63.






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