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PO304.Code means there is a miss fire on cylinder #4. That is what they call a generic code for all manufacters, It mostly has to do with a bad Spark Plug or Spark Plug Wire on cylinder #4. Or it could also be the coil pack going For that cylinder, Depending on the mileledge on your car. End if it is (Abuse)
Have the spark plugs and wires been changed? If yes then are the spark plug wires routed and loomed up correctly? If not check for exhaust damaged wires.
check spark plugs and distributor. look for bad wear and missing parts. It must be a faulty spark plug which is not igniting fuel in one cylinder. If you decide to replace the plugs its best to change all of them.
usually rough Idle is not noticable at high ildle. Once it is idles normally try Disconnecting one injector at a time. If the idle stays the same than that cylinder is the culprit. Remove that spark. If it is wet than do a compression test. Should read better than 100lbs of compression.If compression is good take a spark plug and hook it into the end of the plug wire.Lay it across the intake,start the car and watch for spark. If you have spark than you probably have a bad injector. A miss will cause the vehicle to idle high. The computer is trying to keep the car from dieing out. Hope this helps. No spark do a tune up.
could be a wire crossed, or it's out of time. since you used motorcraft plugs, did you set them properly to the correct gap? replacing plugs without gapping them can cause the sluggishness, out of time can cause the mis-fires and rough running.
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