Please, don't touch the injection pump.....it has nothing to do with your issues....don't touch it, till all the other stuff is up to power and then if you really really really and I mean really feel the urge mess with the injection pump....

Start with the fuel system, drop the tank and clean clean clean.....install new fuel filters both, replace fuel line....install new primer pump.....have your injectors rebuilt or get a rebuilt set....great member here does that...

Next valve adjustment, air filter, oil change

Third linkages, don't just play with them set them to the proper FSM specs....I doubt your car is an 1985 so use the 1981 with type m pump specs

30 Accelerator Control - OM617

Now let's focus on transmission...a trans that isn't working correct will also effect performance...

Service the trans, drain the old oil....from the torque converter and trans....replace with dex/merc fluid and new filter....read the dipstick when the car is warm and idling in park....

Fix any vacuum issues....

And confirm the Bowden cable if you have one is correctly adjust and not broke...

Confirm that all the shifter bushings are in place....should be four of them.

Now lastly, let's face facts....your car is slower then a Volkswagen bug....I believe yours is 88hp, in altitude they lose 33%.....your hill speed is totally on track.....I have a non turbo, that I believe its pretty close to full service and maintenance....I reach a hill here and I am down to 50mph.....

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