If you go to dieselgiant.com, there is an excellent article on troubleshooting the glow plug system.
The clunk when stopping is due to insufficient vacuum reaching the transmission modulator. In other words, you have a vacuum leak somewhere. On my car, the clunk problem was due to intermittent leaks in the vacuum switches mounted on the valve cover. I ended up just bypassing them to correct the problem.
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Palangi
2004 C240 Wagon 203.261 Baby Benz
2008 ML320 CDI Highway Cruiser
2006 Toyota Prius, Saving the Planet @ 48 mpg
2000 F-150, Destroying the Planet @ 20 mpg
TRUMP .......... WHITEHOUSE
HILLARY .........JAILHOUSE
BERNIE .......... NUTHOUSE
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