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go back to basics
do cylinder compression test, dry and wet
if compressions 25 psi lower than another one this can cause rough idle(valves leaking)
should be 150-180 psi any lower engine wear.
check pcv hose from rocker cover to throttle body especially port in throttle body for blockage.
are any codes being set?
Sounds like you are you referring to the,"Throttle Position Sensor". You can check that with an ohm meter to try and verify dead spot. remove connector, hold probes on pins, have someone slowly & steadily push gas pedal. Readings should go up & down smooth & gradual, any sudden loss or jump in reading would indicate dead spot.