98 ml320 92,000mi .intermitently slams in to different gears at will! highway or city driving. you can be going along and then slam 6000 rpm . now it is doing it more and more frequently.now it wont go into overdrive at all till the next day when it cools off. and it also wont down shift when you come to a stop. it may be a sensor of some sort because the engine is running rough while all this is going on. the next day you start it up and all is fine. no dash idiot lights. never changed the fluid mbz says change at 100k. thanx John

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg

check for fluid leaks.

check for fluid contamination in control unit.

take to a trusted shop.

Have the car scan for fault codes.

no fluid leaks,how to check for fluid contamination of controll unit?, and will the trans produce fault codes? thanx John.

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88 W124 3.0
96 R129 119eng
06 ML350
98 ML320 sold
02 CLK55 amg

trans ecu is under the drivers lower dash panel.
Yes you can check the trans. ecu for fault codes but more important is the adaptation data. which can only be interpreted by soemone who knows what they're doing -so take it to a trusted shop.
There is no good DIY way to mess with that tranny -if that's what you're hoping for.