You sure you connected the spark plug wires to coil pack in proper order? Double check it.
No break in the PCV vacuum line, is there?
Change out the crank position sensor and clean the MAF sensor. YOU TUBE will show you how. don-ohio (:^)
Verify the plugs are gapped properly.
Might check to see if catalytic converter(s) are plugging.
Have you run a compression check on that cylinder? Have you verified the fuel injector is working?
SOURCE: 96 ford taurus
Had the same problem with a Ford Ranger 4 cylinder. It turned out being a blown head gasket between 3rd and 4th cylinder. Compression was blowing from one cylinder to the other. Some times it ran great then others it couldn't pull it's self.
SOURCE: 2002 Ford Explorer V6 misfire
check for spark/fuel /vacuum -air leaks.....test plugs..then wires .and egr valve and snorkle and intake areas for air being introduced near each cylinder with carb cleaner wafted near then while idling
SOURCE: I have a 2001 Windstar, the wife has been
If the fuel filter made a big difference, then the most likely was water. Add a can of alcohol fuel drier and see if that helps. Water is much more adhesive than gas, so acts like a thick slug that plugs up injectors.
SOURCE: 2000 ford explorer ohv 4.0I replaced head gasket.
Do a compresion check, if Ok then timing chain is ok, try some throtle body cleaner trough a vac. hose while cranking if stars, fuel pump is out, another way if you have no codes the most poss. cuase is your fuel pump, check press is gauge handy
SOURCE: I have a 2003 Expedition
Most likely the coils. Easiest way to check is swap them with another cylinder, start it, pull the plug wire connecter and if it doesn't change the engine the coil is bad. If it is the injector, then you can check it with an ohm meter. Touch the leads in the injector it should read 11 to 15 ohms. if you need help let me know.
Randy
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