2000 Honda Civic Multiple Code mystery

Background info: I have a 2000 Honda Civic with 120,000 miles. The timing belt was changed about 10,000 miles ago, tune-up about 5K with cap, wires, plugs and rotor replaced.

I've been recently getting a check engine light. A diagnostic on the check engine light reveals TEN codes, all of them dealing with the miss-firing spark plugs, low compression, etc...

Compression is fine. Car runs great with no hesitation, no skipping. But the codes keep coming up after they've been cleared.

Any suggestions as to what might be the problem? FYI, this occurred BEFORE the tune-up so I know it can't be anything to do with that.

Thanks in advance for your help.
Let us know what codes you have ?
So we can help you out.
Indy