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The 3.1 is very common for fuel injectors plugging up. Take it to an independent Garage and hvae them professionally clean the fuel injectors. The in tank additive will not solve this.

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โˆ™ 2015-07-16 18:24:23
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Q: If you had 2 coil packs with the module and plug wires replaced on your 1996 Lumina and the check engine code says random misfire again how do you check which coil pack is bad?
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