I have a 1989 Nissan Sentra 1.6L 4-dr sedan and had the same problem.
The problem is the pressure plate. It is worn and doesn't push the gear into place and hold it the way it should. I have pictures of it on my website so you know EXACTLY what it looks like. here is the address:
You'll have to call around. Looking on the Net shows that the price can vary quite a bit from place to place. It shouldn't be over $100 for the plate. It's about the size of a dinner plate. that is rong it is a bad sinkro if it was the plate it would do it in all gears Have to agree with the last line, I have just repaired mine. The new gear is very expensive, but the old one can be re-cut which is cheaper and seems to work fine.
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