I'd suggest that in fixing the fuel problem, a vacuum hoseor fitting got pulled loose or broken. Start at the main vacuum hose to the brake booster and follow every line looking for a loose or broken connection.

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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