Misfire cylinder 2, 3 and 4

[bastereo]

Your friend is wrong, there is no way that is a cat failing.
Your car has 2 cats, one for cylinder 1, 2, and 3 and a second cat for cylinder 4, 5, and 6.
See you your cylinder 2, 3, and 4 are in both cats and there are 3 other cylinders without problems.

Coil problems are common, but 3 at once is odd...
Did you replace the plugs at 100k?

[germangs]

No, I did not replace plugs at 100K. You think it could be issue?
One more point that I forgot and wanted to mention is that I was at the gas station that day filling up. But I use that gas station every week always premium.