1999 Honda Odyssey and it is sputtering. on 1999 Honda Odyssey

Check engine is on. When it is read it says all cylinders (Spark plugs) are miss firing.
Any ideas?

Asked by for the 1999 Honda Odyssey
How many miles on it? How long have you had the check engine light on for? 1-2 months? Longer? WHAT DTC(s) SPECIFICALLY p0300 , P0301-P0306. do not DRIVE IT IF THE mil IS FLASHING WHILE RUNNING! WILL CAUSE MORE DAMAGE. Inspect spark plugs (keep in cylinder order rear bank(firewall side from pass. to drivers side is 1-2-3- , front bank from pass. to drivers side is 4-5-6-. Carefully inspect each coil pack for heat damage and also keep in order. IF any of the coil packs have an excessive amount of what looks like rust build-up (light dry brown) or bluish-black hot spots on them (those may be harder to see unless moving around under light til at the right angle) suspect them as faulty. replace as needed after verifying.
1 more answer
Check valve lash adjustment, spark plug condition, EGR system performance.