Describe your primer pump. Is it white and requires unscrewing to operate or is it black and springs back when you press it? The old white kind can leak air and cause stalling.

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1979 240D- 316K miles - VGT Turbo, Intercooler, Stick Shift, Many Other Mods - Daily Driver

1982 300SD - 232K miles - Wife's Daily Driver

1986 560SL - Wife's red speed machine