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I was experiencing some rough idles and noticed that only half of my plugs on each coil was working. (91 2.3l has 8 plugs & 2 coils) so i figured the ignition control mod. was bad took out the old put in the new still not right. but worse now it won't start at all. I hooked up the blink tester under the hook and all it sent back was that the egr valve was not in tune. Don't think that is the problem. Has anybody ever had this happen?