Transmission or something else?

paulmidipaulmidi Member Posts: 6
edited June 2016 in Mercury
When my car is in drive and my foot is on the brake and I let my foot off the brake to inch forward (like at a fast food drive thru) my car will sometime jolt forward and it does the same thing in reverse! It could even get away from me if I was not carful.
Does anyone know what might be wrong and how serious is it?
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