A throw-out bearing failure usually makes a lot of noise as you engage the clutch since the bearing is being accelerated to engine speed. Your symptoms sound more like the clutch is not fully releasing, or the gearbox is worn. Check the fluid level in the clutch master cylinder that it is correct, and the fluid is not gummed up and dirty (dissolved water in old fluid). If it is, try to bleed the clutch to ensure the hydraulic operation is good. The slave cylinder may also be weak or a mechanical problem with its operation.
Hope this helps.
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Art
2000 Taurus SEL Wagon 3.0 Vulcan (daily driver)
1993 Taurus GL Wagon 3.8 Essex
1991 Mercury Grand Marquis LS 5.0
1986 Chevrolet 3/4 ton pickup 4x4 350 with turbo400 and 208 transfer case
1978 Chevrolet 3/4 ton pickup 4x4 custom 6.2 na diesel with turbo400 and 203 transfer case
Planning 2008 Taurus X in a year
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hanging tach 
Linear Mode
