One way I did it in my shop, worked esp well on headers, I had an infared thermometer would point it to the exhaust ports and see which one is colder. Another way is to use a good set of wire pullers and pull and replac the wires in succession untill it does not make a diff and there is youre problem
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99 Dark Green 'vert White Top
3.8L V6
BBK CAI
MSD 8.5mm Wires
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'06 Satin Silver GT {SOLD}
You can get a tester cheap from harbor freighy that hooks inline. it is clear and you can SEE the spark jumping-or not, in your case! It will not find a bad plug, but everything befor it. Good luck, misses suck sometimes.
Well, since you don't have wires, they'll just look at the plugs, or disconnect the coil packs one at a time. Looking at a plug is probably the easiest way. A misfiring plug will be black.