Manufacture date 5/1976, automatic, no sunroof, around 180K miles. Owner says it needs rebuild due to hard starting and low power until warmed up. It has a little rust behind the rear wheels but a pretty good body otherwise. The interior is a little worn but mainly dirty. Headliner has come untucked around the edges in places.
When the key is turned on the glow plug light illuminates but never goes off. It started roughly and stumbled horribly for a couple of seconds before dying so I quit until I can look it over in the daylight. (Ambient temp was about 38 F.)
I know valves out of adjustment will cause hard starting and the other symptoms he described but I have a few other questions:
What is normal GP light function on this car? I have a 1983 240D and am familiar with this system but not the 115.
Owner stated that top speed was in the low 80's. Is this normal for this car? I used to have a 1978 300D and that was not the case so I'm hoping that it's just a fixable problem.
Asking price is $1000 and I'm going back this weekend to check it out again. Other than the obvious what all works and doesn't, what advice can you knowledgable folks offer?
Thanks in advance!

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1983 M-B 240D-Gone too.
1976 M-B 300D-Departed.

"Good" is the worst enemy of "Great".