Date registered: Dec 2005
Vehicle: W211 E320 Bluetec R129 SL500 - $1300 car ........ Ford F350 6l
Location: CA Bay Area
Mentioned: 9 Post(s)
Quoted: 1122 Post(s)
The common way diesel is having such problem is air sucked in the fuel lines.
Try to remember what makes the difference?
Like full tank, parking with front lower, what puts tank higher towards engine and so on.
Most of the engines have clear fuel lines to observe air bubbles in them. Check if you have something like it on your engine.