Depending on how many miles, maybe a new timing chain.

This is the step adjusting the ALDA corrects, perhaps. As it will get your timing back to factory specs.

Not sure how to turn up the boost, but you need more fuel as well for it to work. Vacuum modulator, for the engine fuel system? Haven't heard of that either.

There is a web site dedicated to super diesel type tuning, most here, myself included, prefer a stock set up.

You have good list going.

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83 SD

84 CD