Fix the vacuum leaks. New boot between air meter horn and throttle body (check the clamp at the throttle body, likely it's loose and tightening it will temporarily improve things), idle control valve hoses, injector seals, injector holder seals. Until you get the vac leaks fixed, you cannot set the idle mixture. Only change the setting on the EHA if you are measuring the duty cycle and have verified that it actually needs adjustment, else you are going to make things worse, not better.

You should have instant strong throttle response -- if you have throttle "lag", you have vac leaks.

Check the fuel pump relay, too -- if it gets hot, replace it. Intermittant fuel pump operation will cause all sorts of idle problems.

Peter

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1972 220D ?? miles
1988 300E 200,012
1987 300D Turbo killed 9/25/07, 275,000 miles
1985 Volvo 740 GLE Turobodiesel 218,000
1972 280 SE 4.5 165, 000 - It runs!