Engine revs 3,000 to 5,500 RPM's before it starts moving

I do a lot of long distance traveling in my car. When I let the clutch out and push throttle in engine revs 3,000 to 5,500 rpm's before it starts moving. Even with clutch all the way out. Clutch pedal feels exactly the same it always has felt. Nice and firm. It does the same for shifting through the gears. And the same for reverse. This is my daily and I cannot afford to lose it. Every now and then it will take off like brand new. But not often. Please help.