Follow cable from throttle linkage area to transmission. Check that where it attaches, to transmission, moves freely with gas pedal to floor & then released. Vehicle off, in park obviously. It may be a seized throttle valve linkage, just apply penetrating lube like WD-40, and try getting it to move farther & more free by hand, as well as with pedal until it returns all the way as it should. Let me know what you find.
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