I agree with WSanford, the

I agree with WSanford, the flickering could be any number of things, best way to see if its in the final is to render/export it and judge off that, if using PP you can just render/export the part/clip you want to check, or just add it to a new sequence and just render/export that particular sequence, which would probably be quicker/easier unless you note the time in/out points of the clip.