Hello

My Z sat for a year and I've been starting the car a couple a times a week for the last 8 months and the Z fires up sounds good. but 4 months ago started the Z exhaust smells like rotten eggs. my guess was bad fuel so I just keep starting it till the fuel run off and put a fresh gas. Then my Z check engine light came on p0300 and the rotten egg smell idle rough and bogging out when pressing the gas. I changed spark plugs clean the MAF sensor check if there is any leaks and also check the coil packs they all look good. So now im stuck with a p0300 code and maybe a bad catalytic converter . my question is will a bad cats cause misfire? before I start replacing sensors and plugs
THANK YOU!

 

Welcome and congratz!
You don't state the mileage, clogged cats can produce a sulfur smell and a P0300 code, not sure how likely that is if it's not being driven...
You have 2 catalytic converters and 4 O2 sensors, before you throw more $$$ at it, why not spent $75 for an independent shop to diagnose it? Gl

 

100k miles on it 06 base model. thank you! hopefully they can pin point what broken part when I bring it to a shop. i only have the torque obd app on my phone doesnt really tell me any details just a p0300