the transmission on my 2000 Subaru Forester sometimes slips, car just drifts backwards on a sloped road, when I put it into drive. Generally it works fine. Once an awhile it, in bumper to bumper traffic, will not engage for a second or so even though it has been in drive the whole time. Amny idea what the problem could be and how expensive it is to fix it?
Optional Information:
2000
Subaru Forester
Already Tried:
nothing, except to wait for the transmission to engage once backed out of driveway