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I really wish i did the wet test to know for sure if its the piston ring. If you read between the lines on the ad 6 of the coil pack were replace recently right but when it was started car was misfiring still.(if you were to diagnose misfiring in obd1 this will be the sequence spark plugs > coil packs> check compression)
If one of the cylinder has low compression then it will misfire
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