I had a similar sounding problem on my old 1993 Lexus. In my case it was the car's computer. The capacitors on the circuit board went bad and it caused the fuel injectors to be constantly open. This flooded the engine. It would run, but very badly and it blew a lot of white smoke out the back. I replaced the capacitors and the problem went away.
SOURCE: check engine light, on and running rough
This misfire is most likely due to bad injectors. Check injector pulse with a NOID light. If pulse is good you need new injectors. However before you do all of this get a compression guage and check compression on all cylinders. The numbers shouldn't be more than 10 psi difference in all cylinders for example if cylinder# 1= 160 psi cyl#2=168 that's good but if cylinder#3= 176 and 4=179 there is a problem with 1&2. bad valves or bad head hasket etc. Good luck and thanks for using FIX YA.
SOURCE: runs rough/worse, backfire sputters, smell fuel
make sure all wires are secure on the plugs. Make sure that if you bought the plugs aftermarket, that they are the suggested equipment from the Ford (http://www.car-stuff.com/carparts/fordtaurus20002000motorcraftmisp432154315.html Make sure the plugs (gap) were not damaged during installation. Check the firing order is correct. (1,4,2,5,3,6)
SOURCE: 1997 ford explorer 4.0 still runs rough after
It could be many other things. Have you changed the air filter? I could be extremely dirty or it could even be a vacuum leak that is making it run rough. Is there a check engine light on? If so that could help find the problem. If it's not something that simple you would need to start looking to see if all cylinders have the correct compression because it could be a blown head gasket or some other internal engine problems. Let me know if you have any further questions. Thanks for using FixYa!
Testimonial: "thank you.. and yes the engine light is on and flashs sometimes.. the code read that i had 4 misfires before i changed the plugs and wires & coil "
SOURCE: 1999 jeep grand cherokee keeps missing and smells
Try changing the O2 sensor before the catalytic converter... mainly if you have seen a change in the gas mileage.
SOURCE: 2000 ford taurus crank sensor wiring diagram
follow this link and take your pick of many diagrams for the crank sensor. http://images.search.yahoo.com/search/images?_adv_prop=image&fr=yfp-t-900&va=2000+ford+taurus+crank+sensor+wiring+diagram
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