Two things you have not mentioned that I've had to replace on my 88 TE:

Injector holder o-ring seals (bet you didn't know there was such a thing, eh?)

Boot between air flow sensor horn and throttle body. This shrinks and leaks at the idle control valve hose fitting (the fitting will pull out easily if bad) and at the clamp connection to the throttle body. Big air leak, crappy throttle response, hard starts, and stalls on decleration (plus dirt in the ICV, causing it to stick). Check the clamp on the throttle body -- if it's loose or has been completely tightened (ends touch) the boot is shot, time for a new one.

Check the idle control valve hoses, I've had one split in a couple years of use along the "seam" -- too much mold release agent, I think, didn't vulcanize together.

Check the line to the brake booster, and the booster itself, too -- a split booster diaphram will cause stalls on braking.

And check the cap and rotor for carbon tracks.

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!