Is it possible for a car/truck's computer to be worn out but the vehicle is still able to start and run?

Question:
If a worn out computer/ecm is possible,what are some signs of a worn out computer if the vehicle still does run??This would be for a 1987 GMC 350 tbi.

1996 POWERSTROKE automatics?

Thanks to everyone who answered my last question but i tried to add details to it and i accidentally deleted it.Sorry.

Answers:

i have a 99 honda civic it wont go into gear when the car is on but it will if the car is off why?

Worn out is not the term you should use. There are no moving parts (unless you include electrons). Parts of the ECM may stop functioning ie. injector drivers, solenoid drivers, etc. but mostly this caused by something else overloading a circuit. If an old ECM works then use it. Once installed, it can be scanned for function.

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power steering pump for a citroen picasso 2ltr hdi, need one.?

Yes I had a 1991 Olds wagon with a bad computer, poor milage but it ran, just order a new computer chip and replace it (instructions and tool come with the new chip)

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