for some reason, my second gear is not working correctly. It feelsalmost like it is in second, but as soon as I let the clutch out and accelerate, it pops right back out. I sometimes can get it in there but with great difficulty. This started about three weeks ago, and gradually got worse, and worse, until now, I just go from first strait to third. Could it be my synchro? Any ideas of what I should check?