Though I'd share my experience with my 300 sdl running rough. The car would run rough hot or cold. I was thinking valve timing or injectors or injector pump. Turns out it was the ERG valve. I removed the valve and cut a solid gasket out of a coke can and then plugged the vacuum lune off with a golf tee. The car runs great and very peppy. A bonus was that my cruise control started working due to the increase in vacuum.

Mike

That's odd. The cruise control has nothing to do with vacuum.

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Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

I am not familiar with your car but a thin piece of Aluminum can easily melt at Exhaust temps. I think I would be looking for something that will hold up to the heat better to block off the EGR.

The Cruise Control is probably working due to the Engine running steady.

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84 300D, 82 Volvo 244Gl Diesel