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2001 Acura CL Check engine light

I have a 01 Acura Cl, with about 80,000.

The check engine light came on. It had codes for random misfire, started in #1, then rotated thru all 6 cylinders.

I changed the plugs and reset.

Came back on.

I added injector cleaner, (BG, then seafoam). reset the light, It returned.

I have tried a new coil in the #1 clylinder to no avail.

What should I do next?

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