Engine Dead - Need help

[2TrunkSteve]

I posted recently that my 1997 Boxster with 52k miles died. I was driving along and the car started hiccuping. By the time I got to my office it started hiccuping bad and the CEL came on and the engine died. I towed it home. I have a code reader and this is what it said.

P0300 Misfire Dmg to Cat
P0301 Misfire Cyl 1 - Cat Damage
P0304 Misfire Cyl 4 - Cat Damage
P1313 Misfire Cyl 1 - Emissions Related
P1316 Misfire Cyl 4 - Emissions Related
P1319 Misfire - Emissions Related

I changed the spark plugs and the coils. The plugs in cylinders 1 and 4 were darker than the other 4. I also put in a brand new MAF. The engine turns over and sounds like it wants to start, but it just won't catch. I pulled a spark plug and it appears to be getting fuel to the cylinder. This weekend I plan on removing the oil filter and cutting it open to inspect that just in case this is a dreaded bigger problem.

Any other ideas? It appears the engine is not getting ignition. What could be causing this?

Thanks in advance for any replies!