I have had simular problems It took about a year to find.
What I found is as these volvos get old you start to run into electrical problem such as the plastic insulation begins to go stiff & hard. What happens is the wire in hot areas in engine bay develop cracks in the insulations & the copper wire gets contaminated & breaks. The wire looks perfect but under load or movement you run into intermittent faults.
How do you find the fault!!
Well wiggle the wiring loom in the engine bay very carefully while engine is running & look for stiff & damaged wires.
If your very keen its a very big job from the grey multiway connector on the fire wall just above & behind the engine replace all the suspect wires down to the engine. Not recomended unless your confident & you have a copy of the wiring loom.
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If you have a lot of miles on your van , 100,000 or more , have the transmission serviced. But before you do that , check the vacuum line to the modulator valve for leaks or breaks In the vacuum line .
When going around the corner it could have possibly moved the oil far enough away from the level that it's reading was low going around the corner but then getting on to a level surface evened it out. You shouldn't have checked it immediately when you got home. Wait until the engine cools down then check it,
Try pulling I A C (idle air control) motor & cleaning it good with throttle body cleaner , as well as port it came out of . These quite often get gummed up at pintle of motor (pointed part) and shaft, which cause it to stall etc on corners, under load etc. It maintains proper idle under these conditions. If it cures it only for a while & starts to do the same again, change the IAC motor. They never, or very rarely store a code, so it isn't something that comes to mind very often unless experienced with symptoms.
Sonds like a sensor putting out an error code to shut it down ( like a fatal error code) Prolonged vibrations and heat can make cam sensors, maf, o2 senosr do craz ythings which will actuate a govener and stall your car...could also be you fuel pump causually telling you that "hey im bout to die".I dealership can run a stress test (if you will) to check the longivity of the pump...
Good luck hope this helps :)