My shifter is sticking when I down shift. It happens in all the gears but not all the time. So when I shift from 4th to 3rd, the lever does not come back up so I can go to 2nd. If I hit it with my foot a little then it will come back up and I can go down another gear. This only happens on down shifts, no problem up shifting. I have no idea what could be causing this, has anyone had this issue before? Any help would be great. Thanks.