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The pump might be worn, but more likely it's just misadjusted. They are touchy beasts and demand a careful hand. If you're in a warm climate, bypass the coolant loop that's on the intake. That was a short-term fix they did that really didn't help the drivability of the car so they undid it.
If you have an M130 handy, by all means, drop it in. But don't give up on the original power plant so casually. Go through all the tune up and maintenance steps one at a time.
- Valve clearance
- Valve timing validation (looking for timing chain stretch)
- compression
- Ignition timing
- Ignition advance validation
- fuel pump behavior
- coolant system behavior (especially how it interacts with the FI pump)
- vacuum leaks
That's just off the top of my head. Each of these systems is covered in the big blue book and for each, mercedes published "optimum" values. Do what you can for each to make those optimal values hold and watch the car perform better at each turn.
As Chris Johnson puts it in his sig, "If you aren't constantly impressed with your car, then it needs fixing".
-CTH
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