Leaking valve cover gaskets - repair estimate $1000.00. Is it worth it?

No it is not worth that much, you can do it yourself for about 20-40 dollars (price of the gaskets)

follow these for better instructions go to www.autozone.com and register to become a member
this will give you access to their repair database there you can specify your car and get repair info.

Removal & Installation2.0L Spi Engine

1. Loosen the clamp and disconnect the engine air cleaner to valve cover hose from the valve cover.
2. Remove the two ignition wire separators from the valve cover. Position the spark plug wires aside.
3. Remove the three valve cover bolts and remove the valve cover and gasket.

1. Install the three valve cover bolts and remove the valve cover and gasket.
2. Install the two ignition wire separators from the valve cover.
3. Tighten the clamp and disconnect the engine air cleaner to valve cover hose from the valve cover.

1. Disconnect the crankcase ventilation hose from the fitting on the valve cover.
2. Disconnect the wiring connector at the oil control solenoid.
3. Disconnect the speed control (if equipped) and the accelerator control cable.
4. Position aside the accelerator cable.
5. If equipped, disconnect the speed control cable from the bracket and position aside.
6. Remove the ignition wires from the spark plugs.
7. Remove the bolts and position the upper timing belt cover away from the valve cover.
8. Remove the valve cover.
9. Fully loosen the ten bolts.
10. Remove the valve cover and valve cover gasket.
11. Inspect the valve cover for damage. Install new cover as required.
    CAUTION Do not scratch or gouge aluminum sealing surfaces or oil leaks may occur.
    
12. Clean and inspect the sealing surfaces of the valve cover and the cylinder head. Both surfaces must be clean and flat.

1. The valve cover gasket and the valve cover must be installed and the bolts tightened to specification within four minutes of sealant application.
2. Apply a 0.1 inch (3mm) bead of silicone sealant in two places where the front camshaft bearing cap meets the cylinder head.
3. Install the valve cover.
4. Position the valve cover gasket.
5. Position the valve cover.
6. Tighten bolts in the sequence shown.
   
   

   Fig. The proper torque sequence for the 2.0L DOHC Zetec engine
   

7. Install the upper timing belt cover bolts.
8. Install the ignition wires.
9. Connect the oil control solenoid connector.
10. Connect the crankcase ventilation hose.
11. Connect the speed control (if equipped) and the accelerator control cables.
12. If equipped, connect the speed control cable to the bracket.