I would check the boost limit line as described by DD44. If it is clean and functioning search for "alda adjustment". Also wouldn't hurt to check injection timing. I had to take care of all these things before my 83 was able to get out of its own way.

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81 300D Turbo 190K sold
83 300sd 319K best $500 I ever spent-daily driverw/ 2 tank WVO set up