Subaru Legacy owners have reported 2 problems related to car will not accelerate (under the electrical system category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Subaru Legacy based on all problems reported for the Legacy.
While driving engine light and cruise lights come on and vehicle will not accelerate. I almost got rearended because of it. It set a code #p2138. It is very dangerous and there should be a recall on it.
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While crossing a four-lane road, the accelerator pedal went limp and caused the engine to become unresponsive. The car would not accelerate and barely made it across the lanes of traffic to the median safely. The check engine light illuminated and when placed into park, the engine revved to approximately 2500rpm without my foot being on the pedal. I turned the engine off, and restarted it only to have it rev again on its own to 2500rpm. It took 5-6 attempts to restart it before the engine idled appropriately and the accelerator became responsive again. The check engine light remained on and obd code p2318 was returned when I plugged in a scanner to the port. This is not the first time this event has occurred; it has been random and sporadic for about 8 months now, sometimes occurring as often as 3-4 times per week to going 2 months in between episodes. Speed does not seem to be a factor, it's happened at both freeway and parking lot speeds, in all kinds of weather and at various temperatures, with the cruise control on and with the cruise control off.