DOT 3 brake fluid is affecting the clutch hydraulic system.

Drain the clutch hydraulic system, refill the system with clutch hydraulic fluid (GM P/N 12345347 or equivalent), then bleed the air from the system.

Refer to Hydraulic Clutch Bleeding .

The clutch pedal bushings are worn or dry.

Inspect and lubricate or replace the clutch pedal bushings.

Refer to Clutch Pedal Replacement .