check the coil pack
It is feeling silly and my other answer is it is behaving badly
vacum leak
check cap and rotor..... check valve clearance "cold"
Coil pack on one of your spark plugs may need to be changed. Have OBD II scan done to determine which one.
First thing to do is have the computer scanned. If it is misfiring it will have set a code. Auto Zone will scan it for free except in Calif. Use that information to try and determine the cause. It can be plugs, plug wires, O2 sensor, camshaft position sensor, among some other things.
Fuel injector?, wire? manifold leak?
Bad plug or something is misassembled.
I really hate to be the one to tell you the bad news but it is possible that you have bent some valves. Take the spark plugs out of the missing cylinders and run a compression check on those two.
have you recently changed the timing belt? or maybe it's off a tooth.
Bad plugs/coil/wiring
It is probably your spark plugs misfiring.
In a 1995 Ford Taurus : ( there are 6 spark plugs ) for the 3.0 or 3.8 V6 engines