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Originally Posted by dscannon
Yes, it runs rough and I have to give it a little gas once I get it started.
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Well in that case I'll go ahead and recomend a new OVP (behind the battery under the plastic cover piece):
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1FX0MB1RS1IC00CTTV&year=1989&make=MB&model=300-E-002&category=P&part=Overload+Relay
If your ABS light is also on... thats almost certainly what your looking at.
As it's running good
when warn it's something in the warm up mixture thats off... the OVP protects that circuit... If you ABS light is not on you might want to have the water temp sensor (on top of the engine block) tested:
http://catalog.eautopartscatalog.com/mercedesshop/sophio/wizard.jsp?partner=mercedesshop&clientid=catalog.mercedesshop&baseurl=http://catalog.peachparts.com/&cookieid=1FX0MB1RS1IC00CTTV&year=1989&make=MB&model=300-E-002&category=C&part=Water+Temp.+Sensor&appEngines=_any
As the coolant warms up it's resistance changes to inject more fuel to a colder engine.
I think these are your best starting points.
Edit in bold