I own a 2011 Camaro with the 6 speed standard with 17,000 miles. Two weeks ago I started her up and it sounded like it was running really rough

As it warmed up it felt like it smoothed out. almost sounded like a back fire. however it you could really only hear it in the cab. The sound is getting worse every day. I have narrowed it down to not being the motor but something transmission related. Possibly broken mount/ clutch/ something??? has any had this issue???