Could have stopped up cateletic converter
On the ML and almost all Mercs you need to get the codes rread first when you get a problem. For about $50 you can get a reader so youhave an idea of whats wrong before you start spending money. ML's have a quite good sensor system so it can narrow things down quite a bit.
In your case it could be a plugged catalytic convertor or a fuel pump problem or even a dirty airfilter dirty maf or cracked hoses. It does pay to find out what the problem is here. A plugged cat from MB will cost more than $800 but and aftermarket one is about $90 same with a maf and so on. Most things are quite easy todiy on a ML and if you order the parts online ( most places have oem parts much much cheaper) then your ML is cheaper to run then a Ford or Chevy. Take it to the dealer/stealer and just tell them to fix it and your wallet is in for a surprise. I own a 320 myself.
From what you descibe I think it is the air mass sensor in the air intake pipe after the aircleaner. try unplugging it and then driving the car, if this make differance to the performance then thats that but it could also be the exhaust thats blocked.
SOURCE: Transmission problem in E230 Benz
What you need to check is the transmission release bearing because if there is a clearance on the release bearing you will encounter this problem and also check the transmission oil.
I’m happy to assist further over the phone at https://www.6ya.com/expert/ramy_d9e7ebea3891f482
SOURCE: 320 Ml Mercedes-Benz
Go to advance auto or auto zone and have the do a trouble code read ( it is free).
The plug is located under the drivers side dash to the left of the brake pedal.
Press the esp off button on the dash and see if ithas an effect. on acceleration
Next I would try this it is expensive.
If it feels like it is bogged down when you first start to acceleratewill only creep about 10 to 20mph it may be the mass flow sensor located between the air filter and the throttle body. It has an electrical connection. Sand eats them up and it is a common item about $200.
SOURCE: My 1995 Mercedes Benz E420 has lost power gradually
Have you check the transmission fluid level? It sounds like it is low. You might not have a dipstick in that unit. I'd add at least 2 quarts and test drive it.
SOURCE: Mercedes Benz car will not shift out of park. It
You are putting your foot on the brake before you try to move the shift lever, right?
Most cars have a locking device that prevents the shifter from moving unless the motor is running (key inserted into the wheel lock and on) and the brake petal is depressed.
Click
the link below to troubleshoot this problem: ---
Car loses power while
acceleration?
http://schematicsdiagram.blogspot.com/2011/12/car-loses-power-while-acceleration.html
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Loss of acceleration?
http://technoanswers.blogspot.in/2012/02/loss-of-acceleration.html
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Acceleration lag problem?
http://repairhelpcenter.blogspot.com/2012/01/acceleration-lag-problem.html
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How exactly the Vehicles
Accelerator Cable works?
http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-cable.html
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How exactly Vehicles
Accelerator Pump Diaphragm Works?
http://repairhelpcenter.blogspot.com/2011/11/how-exactly-vehicles-accelerator-pump.html
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accelerator pedal sensor?
http://technoanswers.blogspot.in/2012/02/2009-chevy-impala-accelerator-pedal.html
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stalls and bucks on Acceleration?
http://technoanswers.blogspot.in/2012/02/nissan-pathfinder-stalls-and-bucks-on.html
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Engine accelerates when brake is applied?
http://technoanswers.blogspot.in/2012/02/engine-accelerates-when-brake-is.html
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This
will help.
Thanks.
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