Hi

It looks like a Crank Shaft Positioning Sensor to me, I had v similar problem, put one in and was fixed $58 at advanced auto parts (my car 2001 e320)

When cold will drive perfect, when hot will die.

Hopefully this is the one you need

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2008 ML320 CDI
2007 GL320 CDI
2005 Audi A6 (sold)
2001 E320 (sold)
2004 lexus RX330 (sold)
2004 Honda CRV (sold)
93 190E 2.6 (sold)
97 E320 (sold)
2000 Honda CRV (sold)
91 350SD (sold)
90 E300 with amg body kit (sold)
83 300sd aqua marine (sold)
81 300sd dark blue (sold)
81 300sd gold (sold)
81 300sd brown (sold)