This is about the flow rate of the PGBK. When the printer prints, it can't make a dark black line with one pass. So when it prints you get a stuttering effect. The solution is to flush PGBK.
Although this took about an hour to clean it. It would have been better to just flush it in the first place rather than use any of the canon cleaner methods. I'm sure there is a use for them, but since this was the first time I cleaned the printer h...
