A code 48 is set when the computer wants to see a Idle speed and for whatever cannot get it.
This can be a Iac motor. Or Unmetered air getting in the intake, or even a stuck timing advance can cause it. The TPS was a waste of money if your diag proceedure for this concern is Swaptronics.
A $38 high failure part is a good start but not the only cause.
Be advised. On a 95 Disco, you can clear the code by pulling the "Fuel Injector" fuse for 10 second and reinstalling. This fuse is located in the underhood fuse block.
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I only worry about myself, screw the others.
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