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What could cause a random cylinder misfire on 99 olds alero I have replaced the plugsthe wiresthe coil packs ignition moduel and air idel valve Im really stuck here guys?

- Check the fuel injector for that cylinder to see if it is clogged or faulty.

- Check the compression in that cylinder to see if there is a mechanical issue.

- Check the valve clearances for that cylinder to see if they are within specifications.

- Check the timing belt or chain to see if it has slipped or is worn out.

- Check the catalytic converter to see if it is clogged or damaged.

- Check the oxygen sensor for that cylinder to see if it is faulty.

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