Good day,

I have been noticing few problems with my 2012 C300 associated with a (misfire)" in some of the cylinders that was indicated by engine light.
I noticed a weaker power with a hard shift in transmission that can be felt and seen on the RPM. Hard shift can be mainly encountered from 1st to 2nd gear and from 2nd to 3rd gears.
I took my car to a workshop and changed the 6 spark plugs but the problem continues the same.
Transmission oil has also been changed recently with but nothing changed.
Lately, I have been smelling gasoline inside my car and I am not sure if this is related to the previous issues.

Thank you.

I meant to write misfire in the topic, sorry for the confusion.