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Hi,
To me, it seems rather hard to understand whether you are talking about the engine pulling you along at 2500 rpm or just the display is staying stuck at 2500 rpm.
The latter sounds like an instrumentation issue.
I don’t know if your cluster is analog or digital but it seems to be a bad connection to a sensor and is not receiving signal updates.
A bad throttle sensor usually causes an idling issue during warmups on some late model 240s with the 3.1 LH system.
It uses a variable resistance throttle sensor like one that I replaced on my sister-in-laws Dodge Ram pickup of 2000 vintage.
Her idle would increase during warmups and only occasionally just after using the throttle.
It would not a repetitively mess up but just enough, to the point to be worrisome in the driveway.
Some vehicles, like a Range Rover, use the alternator for a signal reference instead of the crank position sensor.
How many miles on the alternator?
Not sure if it works that way nor how many other manufacturers follow that thinking.
The Range Rovers use a very expensive Italian made alternator that’s crap.
It sits on top of a special made, for RR, by the GM Chevy Motor Division, at the time, in Mexico.
It had cylinder liners do slip!
Really crazy maintenance issues come abound from many LAND Rovers.
My sister-in-laws vehicle was eventually a mess and it got donated away!
You did say the engine responded to the braking being used and surely hope so!
I used an economy replacement version since the original factory one was bad so early.
The economy one has worked for many more years than I expected because she has kept the truck longer than I expected her too.
Continue to be observant and aware.
Take mental notes to see some arrows of what it does and when.
It’s just starting but it definitely seems electrical.
Phil
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