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If the speedometer stops working the odometer stops also. Sounds like it is stuck in first gear. The RPM went up because the throttle was response to pedal but transmission not response. Check transmission fluid color. Whip off dipstick on a white paper towel look for gray if see any that is metal shavings and transmission is bad.
The speedometer and odometer gets a signal from the speed sensor in the side of the transmission where the speedo cable once was. The problem could be the speed sensor, or something in the wiring, or in the instrument cluster. Or it could be that the transmission is failing internally.
I would look for a broken ground wire..If its a ground wire it should be one of the big ones..Theres one from the firewall to the block..If any body work has been done or major engine work ,,sometimes the grounds are left off..If all looks good it may be in the cluster or the GEM module..
Limp mode; get it checked.. Fault in the transmission. Even if it stops happening for a drive or two, it WILL return. This isn't a problem that will just come then disappear. Could be internals in the transmission or something like a sensor for the transmission that is faulty.
This sames strange but i would say you might have a transmission problem that makes the car revs up because it look like it keeps downshifting after a high Rpm which makes the engine idles high. Good luck
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