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Q: misfire cylinder 8 64k misfires clyinder 1 4k misfires in same time peroid. on 2000 Cadillac Seville SLS

replaced plugs. check engine light on when idle. check engine light blinks on/off when driving.
above misfire data from diagnostic instrument.
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When you replaced the plugs did you notice if the plugs where coated in oil. If you have oil getting into the spark plug tubes you will need to replace the valve cover gaskets to fix your problem and then pull the plugs out and put them back in to remove the oil in the spark plug tubes. This is a common problem on many vehicles that I run into.
No oil, valve cover gaskets replaced, as well as other items in the kit. No residue in tubes. Removed coil springs cleaned tested strength, replaced. Injectors not dirty, additive added to fuel.
What are the codes that are showing up now since all this work has been done. Is it just the misfire codes or are there other codes showing up. Also what codes were there when the problem started before you did all the work you have done to it so far.
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