I had the clutch replaced on my manual transmission Chevy, it has a hydraulic system. This was 3 weeks ago. Everything fine til yesterday when I began having difficulty shifting gears. With the motor off no problem gears go in well but with motor on it is hard to do. I bleeded the hydraulic system, and after a while of running the shifting of gears was smooth. Then at night after work I drove, all well but a few minutes later the gear shifting again was hard to do. This morning I started the car, gears went in easily but after 30 minutes the gear shifting was hard to do. This situation is going off and on. Any help appreciated.