RepairPal Certified shops can diagnose and repair your 1994 Chevrolet C1500. They provide transparent pricing with a minimum 12-month or 12,000-mile warranty on repairs and services.
Check tire pressure.
If its not tire pressure it may be misalignment of the front and back tires. Tire balancing can also be a factor in swerving while driving.
Another possibility can be road conditions.
And with extremely worn shocks/struts this can also happen.