Re: Miss firing all spark plugs and wires have been...
I would check the order the leads go from the distributor to the spark plugs as 1 or 2 of these might be incorrectly placed on the wrong spark plugs causing the mis-firing.
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With the engine running and the cylinder misfiring tap (key word is tap) the injector with a screwdriver a couple of times. If the misfire goes away replace the injector.
my money would be on the coil cover, especially if it had been a long time since the last tune up. it is certainly worth trying, as this is part of a routine tune up anyways. good luck!
You can have car put on scope and it wll show any irregularities in the ignition system. It can also be dowithout any equipment. First, loosing ALL 8 spark plug wires, Now place the spark plug wires loosly back on, just secure enough to secure. You might need 2 people. Being the miss is more consistant in gear, APPLY THE EMERGENCY BRAKE , put trans into drive and raise rpm's till miss is obvious. Remove ONE plug wire at a time, TILL THERE IS NO DIFFERENCE IN MISS. Thats the cylinder missing. Start with the spark plug, inspect, work back to wires and cap. An EXTREME result will be NO COMPRESSION.
well you might have"bad ign wires" or bad ign coil!!!!O2 sensor wouldn't do that usually miss fires is wire ,coil, broken or crack porcelain on spark plug usually done on installing them!!!!!! I know the three spark plugs closest to fire wall are not easy to get at and some time spark plugs get cracked and over looked good luck
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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