Have you tried isolating the brake booster? I found out mine was bad when I unscrewed the main line at the booster, plugged it with my thumb and had my kid turn off the key. It was giving me an intermittent slow shut down. The pump could just barely keep up with the leak.
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1981 300TD "The Green Lantern"
1980 300TD
1983 300D Euro "China Cat"
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