On hot days, if I'm at operating temperature and running at significant rpm (for this particular equation, significant rpm is pretty much anything over 2000-2500) and I allow the car's rpm to drop from that point down to idle (as in, roll suddenly up to a stop sign)(as in, throw it in neutral while at driving speed on the road) (as in, accelerate to move in stopped interstate traffic and then back off once i've pulled up in the line again) (as in, pull around a drive through and then stop at the window), it shudders, and frequently dies completely. idle is perfectly normal at all other times.

In a gas engine, my dad says it's vapor lock, fuel getting hot in the hot fuel lines and turning to vapor before it enters the cylinder. However... diesel has a higher flash point and shouldn't be volatile enough for that to be my problem... is it?

It restarts flawlessly and immediately... but having it do that in heavy traffic is quite dangerous.

How do I diagnose this? I've never heard of it in a diesel before. Fuel filters are good, I do know that much.

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~Michael S.~
Past cars:

1986 300SDL
1987 300SDL
1982 240D
1982 300SD


Current:

1987 300SDL