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Mercedes-Benz ML500 Questions

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This happened suddenly yesterday. Car was low in gas so I put gas. Got home. Tried to start car and it wouldn't start. Lights work and radio works.

How long have you had this problem? A few months
Starts in morning great steady ideal drive down street about .25 mile perfect acceleration till I need to stop at stop sign to merge onto traffic 90% of the time when I press on gas pedal truck will stall ? If I see I don't need to stop I can just slow down and take my turn playing with gas pedal so will not stall then I gun it and accelerates 100% .
Crank shaft changed new fuel pump 5 autozone maf. And then I got bosche maf and all runs well for few day and comes right back ? Code say maf again and again . I do some reports for work on my phone while in truck might be Idleing hr 1 hr or more sometimes and no problem smooth idle I start to go ad no problem accelerating till I spot or slow down in traffic it will stall or I half to through it in neutral flore it and wait till light turn green put in drive and it might hasitate at beginning or be 100% smooth . I bought new wires and plugs but have not put them in cause it runs 100% when it does only at stopping issue so plugs would be bad all the time so waiting to do that ? Everything one this Suv works 250,000 miles bought new and still all original parts except what I changed past 2 months . I read same problems but nobody post the answer to solve problem would like help ?
What seems to make the problem better or worse? Only when coming to a stop light or slowing traffic ? If I didn't need to slow down in traffic or coming off exit the truck runs 100% and powerful if I need to got in it
How long have you had this problem? 3 months now
The radio does not work.The CD was working, but now, it needs a code before I can play the CD.
A/C is blowing, but not cold. I checked freon already and its fine. What else can be the problem? Thx
The main battery was replaced 3 years ago, could it be the small battery beside it?
Hours after I came home, my car has a loud horn like sound coming from under the hood. Theres a big black ball looking thing on the right hand side close to the dashboard that stops the noise when pressed in. What is this and how do we shut it off?
Just bought a ML500 from a car dealer, can hear the drive shaft, not bad bad I guess can just hear it wen driving.
Car also nudges forward sometimes when I stopped & waiting, my foot is on the brake & its in Drive, what is that?..
Also a clunk happens at times when gear change or go to accelarate.
Reverse is quite hard sometimes wen I go to accelerate, have to press the foot peddle at least half down to get movement. If anyone can enlighten me in these things, would greatly help, Thanks Sonya
The buzzing sound lasts for about 2min then goes off, was told air shocks adjusting.
I have the brake light repair kit already installed and still not working I replaced the turn signal bulb socket and light bulb as well.
Replace Sam module 1 month ago n rear windows will not go down n head lamps will not work
I am replacing the brake pressure sensor to stop the bas esp light from coming on.
wan to buy a fairly used transmission for my ml500 mercedes
when driving slow speed my bas esp light comes on thin my brakes lock up why i am brakes driving
The dashboard doesn't light up, and the gauges don't move... So I'm wondering if it's quite possibly a "Fuse box issue", or maybe a "battery" issue (but it's DEFINITELY an electrical issue)
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