Hi All
T'was the throttle position sensor that went to lunch...BUT when that went, the idle control solenoid allowed more air in, which the O2 sensor saw as a lean mixture, and subsequently called for more fuel, resulting in ++fuel with ++air, bypassing the throttle. Thus the runaway... Had I turned off the ignition switch, at sixty mph, the resulting lockup of the steering column might have given me a quick side trip into the bushes. Hmmmm...