Check the charging system for short cause it leading to ignition circuit and is causing a faulty reading....it gonna cause a lot of damage to the other component....like electronic control module,idle control sensor,map sensor.etc and it might damage the PCM(power control module...computer)...but track the short first by using a test meter...it simple...i will guide on the way or your neighbor..lol...good luck
Try having the charge system/ alternator load tested, if thats ok have the ignition module and coil pack tested at a local parts store.
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