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

rough idle-- so I changed the plugs & wires & coil. Didn't solve the problem. What's next????

Asked by for the 1990 Buick LeSabre
Your problem may be coming from the ignition module, I've seen it many times with those coil pack set-ups
thanks, I'll try it and let you know.
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Double check the fireing order. Possible plug wire crossed.
What is the fireing order?