Why scan still comes up w/code 122 afer replacing TPS & then drove good? on 1997 Chevrolet Suburban 1500

No check engine light ever was on. Suburban was cutting out going up hills, idled rough. Scanned & had 122 code. Cleared code, Replaced TPS, drove suburban after & ran good, but plugged scanner in again & got the same 122 code again. Again, no check engine light was on. Suburban is running good now, idles, why is it still runnig the code 122?

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