venomousrotors

New here and seek wisdom. I got these three codes this morning, i looked for similarities in other threads that have this but doesnt seem that anyone has a difinitive answer. I see people with the same symptoms. I change the plugs coils and wires and it idles really bad on warm up as if only one rotor was firing then like a minute later the idle goes up to 2k but still misfires. After its warm it sounds normal but feels under powered. Could this be the cat? Can someone give me a difinitive answer?
2007 rx8
56k
6 sp.manual
Thanks

Roytary

I strongly vote on cat. Do you hear the air pump switching on for way loo long @ start ? RX8's egr setup use the air pump @ cold start to blow fresh air directly inside the exhaust manifold to prevent the ''bbq party'' thats happening inside your cat, melted/clogged cat would move that ''bbq party'' upfront closer to the E/M + restricted exhaust flow, result is : a ''runs like s**t'' @ start, then you'll feel power loss @ operating temps, hard hot starts and might become a engine flooding mess soon.
P0300 : Misfire Detected
P0301 : Cyl #1 Misfire Detected
P0506 : Low idle rpm
Considering coils/wires/plugs are out of the list.
Early signs of flooding would cause all theses. Bad cat could cause those issues.

venomousrotors

Im thinking this also now especially since this morning when i turned on the car and the garage filled up with a rotten smell. That usually means the cat is going out.... fail. I saw a decat kit on ebay for like 180. Think ill have a problem with that since its just a resonator? Or should i put another cat on?