Changing the fuel filters and cleaning out the banjo bolt/lines are good ideas.

You might want to also check out the rack dampener pin on the car. It's basically a screw held into the injection pump with a nut. It's not hard to get to.

On my car, this pin was too tight, resulting in a loss of power at low rpm's. After I adjusted it the difference was significant.

Another symptom of a rack dampener pin that's not quite right is the car shaking after a highway drive.

It's extremely easy to adjust the pin, you should be able to find the procedure with a search for 'rack dampener pin.' I would also recommend taking it out and having a look at it, as sometimes they fail and new ones are required. It has a springy tip, so if the tip isn't springy, a new one is in order.

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Ralph

1985 300D Turbo, CA model
248,650 miles and counting...