1990 Toyota 4Runner Question: Tranmission

Check the cable from the gas pedal to the throttle position sensor and if thats intact then its more than likely the throttle position sensor has failed, I see four or five different brands available average price about $130 for the part

Accelerator cable could have come undone or loose check it \out oops some one already answered sorry Ditto Valleyautotech

have you had the timing belt replaced?