[W126 Coupe] Stalling/idling issue

[Tony Damar]

Hi all,
   
  My 380SE has recently started acting up with a rough idle.  It will start and stay running as long as it's in P or N.  Once under load (in gear or A/C on) the rpm's will drop to around 200 - 400 rpm and the car will sputter and die.  It will start up again immediately.  I suspected the plug wires as some of the insulation had been worn off the boots.  We had a hard rain the day it stalled on me several times this past weekend.  I replaced the plug wires.  While doing so, I noticed that one of the vacuum hoses was loose.  It had broken off (what looks to be) a check valve.  I had picked up one at Autozone (non-MB) to see if it would help.  It's not a perfect fit, but it seemed to make a difference that night test driving around and the next morning on the way to work.  During the afternoon, it did not want to run while in gear.  
   
  My question is what is on the side of the distributor cap that leads to a vacuum line.  It is silver looking and runs to what looks to a check valve (the broken one mentioned above).  Also, could this be fixed by doing what Eric Harder did in removing his air idle valve and blocking it off?
   
  My car has 302K miles on the original engine (newer camshafts).  I had some issues similar to this about 50K miles ago and replaced the following: Ignition computer, idle control relay,  fuel injectors and seals, ignition tumbler, spark plugs and a couple other things that I don't remember off the top of my head.
   
  Next on my list is the distributor cap and rotor and new plugs.
   
  Any and all help is greatly appreciated in advance!
   
  Tony

		
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