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Pull wires of plugs and put in spark plug tester and check for spark, if good spark, good coil pack. (note: Contrary to popular belief, the spark does not have to be blue, it will still ignite gas if orange) If you don't have tester, be VERY VERY careful and use a spark plug and just rest the side on the block of engine. I DO NOT ADVISE DOING THIS UNLESS YOU KNOW WHAT YOU ARE DOING, it send very very high voltage through and it does not feel very good to get zapped, trust me, i know.

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Q: How do you test the coil pack on a Chevy 4.3L?
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