94 with clutch issues

OK, I have 94 4wd V6. My problem is whenever I do alot of stop and go driving my clutch ends up holding pressure to the point that it starts to slip. The clutch, pressure plate, slave cylinder, and throwout bearing are all new. When it does start to slip all I have to do is pop the bleeder on the firewall and I'm good to go. Any input would be appreciated