I have a 5th gen auto Camaro that I bought with this problem and my mechanic hasn’t been able to find it yet. Car is a little low on power, 90000 miles and when cold it sounds fine, when you rev it warm sounds healthy, when you put it under a load when hot, however, with power braking or driving, it aggressively misfires on cylinder 5. Supposedly good wave patterns to all injectors and consistent spark pulse. Mechanic isn’t getting to it in the time frame I want (4 months) so I thought I’d come to y’all.