My '87 300 SDL has been starting harder the last few weeks. Runs rough for 30 secs, more smoke, etc. Very strange as it did this all winter, but cycling the glow plugs twice usually took care if it even when temps were in single digits. Now if I cycle twice, it is still rough.

New glow plugs were installed in December.

Once it settles, all it well, runs great.

Help?

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Alan Hamm
'87 300SDL 277K Miles
'89 560 SL 68K Miles