Sounds like the typical biological organism (trying to avoid the algae-fungus diversion) contamination. Soltron solved the problem for me. Do a search for Soltron and Biobor and you'll find a lot of info.

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Charles
1983 300D, bought new, 215k+ miles, donated to Purple Hearts veterans charity but I have parts for sale: http://www.peachparts.com/shopforum/showthread.php?t=296386