Fuel smell
 

Hi everyone,

I am having a series of fuel related symptoms on my 2009 g37 86k
- long crank start (not weak, just replaced the battery) for 2-3 seconds
- fuel smell at start from the engine block. Smell disappears after start
- weak engine for the first 100 yards after start - a bit as only some cylinders are working or as if the engine is starved
- recently a light rotten egg from the exhaust after stopping the car.

Side note:I replaced battery, spark plugs and serpentine belt over the last couple of weeks. When replacing the spark plugs, they all look good, no excessive or black deposit. Only one spark plug had some oil on top of it. Leak?

What do you think?
Fuel damper? When removing the engine cover, I did not see traces of fuel dripping
Fuel pump?
Defective injector?
Catalytic converter?

Looking for help in identifying the cause before throwing parts at the car.
Thanks in advance for your help!

the rotten egg smell is an indication that the catalytic converter is going bad.