Misfire issues
 

I bought my 2004 rx8 a few months back. I've had misfire issues within the first week of owning the car. I was getting 2 CEL faults P0300 & P0301. I did my research and changed the coil packs, plugs, and wires. Additionally I had the fuel pump go out on me so I replaced that. I also replaced the clutch as it was slipping. The car has no issues starting and runs great under 5,000 RPMS. Anything over 5k the car bogs down and has multiple popping noises. I do smell a gas odor when in the car. Additionally it seems as though the exhaust has gotten louder. I'm thinking this may be the cat but the gas smell has me worried and doubtful that it is the cat. I've tried to look at the cat after driving for a bit but have not seen it glow orange. Anybody have any tips?

6 speed
80,000 miles
CEL codes P0300 & P0301

Engine Power Loss
• chokes as revs increase
o O2 sensor failure (too rich)
o MAF failure
o MAF disconnected
o e-shaft sensor fouled
o accessory belt fraying
• high end power loss (hard fuel cut)
o Rev limit reached
• high end power loss (jerky and stumbling)
o Ignition failure
o fuel pressure loss
o e-shaft sensor fouled
• high end power loss (smooth)
o Catalytic converter clog
o air filter clog
• low end power loss (smooth)
o Engine compression loss
• low end power loss (stumbles)
o Ignition failure
o front O2 sensor failure
• revs slowly but smoothly
o O2 sensor failure (too lean)
o catalytic converter clog
o air filter clog
• sudden power drop at a specific rpm
o Intake valving actuation problem
• trouble getting to redline
o Ignition failure
o front O2 sensor failure
o catalytic converter clog
o air filter clog
o e-shaft sensor fouled
o fuel pressure loss
o MAF failure

Yes your codes are for random and front rotor misfires. So changing coils, wires and plugs was a good idea. What coils, plugs and wires did you put in? They are not all created equal.