I'll be brief as I can.

1) I've been off the forum b/c my 300D has been trouble free for more than 3 or 4 years.

2) Point of thread, my brother wants to fly me out to California to look at his CD w/ 130K miles.

3) Says that when cold, it will attempt to die, as in shudder violently, when coming to a stop but it does not die. Original cold idle after start if fine. Then goes bad when coming to a stop after driving a bit.

4) After achieving running temp, the problem goes away. Hot, there is no shudder when coming to a stop.

5) He can cruise at highway speeds just fine w/ no odd sounds or vibrations.

6) He says that it has a slight nailing, but I don't think he knows what nailing really sounds like.

7) He has a mechanic that says the machine needs a new engine.

8) He, my brother says that the problem is getting worse, but I think the issue may be the same just w/ ruined motor mounts that exaggerate the issue.

-- Linkage and idle has supposedly been adjusted correctly
-- Injectors 1 and 5 have been replaced and supposedly made an improvement but the guess is that something is still wrong with #1 and maybe a slight issue with #5
-- Prechamber was replaced, last effort by mechanic, on #1 and made no difference
-- Mechanic says that the engine needs to be replaced
-- No comp or leak down tests have been performed

Essentially I am sounding off you guys to get ideas before I go out to there. I know it's not easy to diag when I have not driven the car and you guys have no videos.

All ideas and insights are welcome.