To be up front, I own a W123, so this may not apply to you at all (I'm sorry if it doesnt --- im just trying to help out )
On my car, the poker chip primer pump started leaking, and would cause air bubbles to be in my fuel system. When idling and first going, it felt like a miss that would go away.
That may help, or it could have just wasted some bits of internet traffic
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Java Developer/Linux SysAdmin
Current:
*1984 300D ~200K,1989 MR2 250K, 2012 Ford Fusion 4.5K (fiance's car to replace the uber-unsafe cavalier)
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Past: 1998 Chevy Cavalier ,2005 Saab 9-3 2.0T, 1996 Mazda Protege, 1974 Porsche 914 2.0, 1997 Land Rover Discovery 4.0L/5Speed, 1995 Jeep Wrangler
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