It sounds like it could be ALDA related. Just don't bury your foot when you are starting off, you should gradually "feed" in the fuel with your foot.

The '85 IPs are not different other than the fact that they have an electronic rack position sensor on them.

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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