I have exactly the same issue with my 1992 B230F. I replaced the FPR and it made no difference. I switched out the IAC with a known good one and it made no difference. I'll be interested in the outcome of this thread.
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 Present: 1990 240GL saloon, 1992 240 estate
Past: 1988 240GL; 1971 144DL; 1972 145DL
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