My 1997 Subaru Outback recently began to surge while trying to accelerate at highway speeds (60 mph ), making it difficult to gain speed - engine RPMs increase significantly while the car struggles to increase speed.
This is the first time this has happened in more than 175K miles.
The car has a manual 5 speed transmission.
Are there any surging causes that are more likely than others, such as clogged fuel filter or injector filters, or a damaged air intake boot?
Thanks very much.