CHECK THE PCV VALVE HOSE THAT CONNECTS AT THE BOTTOM OF THE THROTTLE BODY, THESE HOSES ARE KNOWN TO DETERIORATE AND ALLOW UNMETERED AIR TO ENTER THE COMBUSTION CHAMBER, WHEN THIS OCCURS THE OXYGEN SENSOR'S SIGNAL TELL THE PCM TO INCREASE THE PULSE WIDTH OF THE INJECTORS CAUSING THE VEHICLE TO ALMOST STALL.
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Are you getting spark to that cylinder, may be bad coil pack, is the injector getting a signal to fire, usually a test light will not work to test them, it pulses way to quick for test light to pick up, a noid light is what we use, it's specially designed for injector circuit testing. Also does it miss while driving or just at idle?? If only at idle even though your compression showed ok it can still be a valve going bad, put about a ounce or 2 of oil in the cylinder and check compression again, if you have a 20 or more psi increase you have either a valve or piston ring problem.
It could be a coil pack. Follow the wire from the spark plug back to the coil pack. each one should run two cylinders. Switch the coil pack with a different one and see if a different cylinder misfires. They are easy to change, just 2 7mm screws hold each one on.
FORD SABLE HAD TWO 3.0 ENGINES. ENGINE WITH CRANKSHAFT PULLEY FACING FRONT TOWARD RADIATOR AND GRILLE. CYLINDERS ON LEFT PASSENGER SIDE IS 1 2 3 CYLINDERS ON DRIVER SIDE THE RIGHT IS 4 5 6 GET PIECE OF PAPER WRITE NUMBER 321 AND WRITE UNDER THAT NUMBER THE NUMBER 456 STACK THEM NUMBERS ON TOP OF EACH OTHER THATS WHERE PLUGS WIRES LOCATION IS THE ROUTE THEM TO CYLINDER SPARK PLUGS NOW IF YOU HAVE THE 3.0 ENGINE TURNED SIDE WAYS.CYLINDERS FACING YOU 4 5 6 AND BACK CYLINDERS ARE 1 2 3 GET A PIECE OF PAPER WRITE NUMBER 456 THEN WRITE THIS NUMBER UNDER THAT NUMBER 321 WITH NUMBERS ON TOP OF EACH OTHER.LINED UP.THAT WILL BE YOUR SPARK PLUGS WIRES LOCATION.THEN ROUTE THEM TO THE CYLINDERS LIKE 1 TO 1 CYLINDER.