Re: 1999 ranger 2.5 coils
You could try swapping the two coils, and if the misfire follows, you know your coil has failed. Look for cracks in the plastic, starting with the 'towers' the wires plug into, and working down towards the coil base.
Plugs #1 & #4 are paired, so if one is totally fouled or shorted, no sparky. They both fire together, as do 2 & 3.
tom
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