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Q: not fireing on cyl 3 & 6 . I changed the ign coil. what's next??? on 1990 Buick LeSabre

Edit
rough idle-- so I changed the plugs & wires & coil. Didn't solve the problem. What's next????
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Your problem may be coming from the ignition module, I've seen it many times with those coil pack set-ups
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