Today I started having some problems shifting my 02 Z with 13k miles... It was hot and I had been running a lot of very short trips (6 blocks and park, ect). I began to have problems putting it in any gear. It wanted to pop out of first and reverse, and even third a few times. Sitting at a stop light it would take a couple of tries to get it into first, ect. It freaked me out and when I got it home and I checked my clutch fluid level which looked ok. I pulled the transmission fill level plug to check the fluid and had some fluid come out so that looked ok. Anyone have any ideas of what else might be going on?