actually now that i think of it i had this problem with a previous ECU.
it was cos the tuner didn't adjust the back-off rate of fuel.
that could be your problem. It had flat spots and backfire also. The fuel was running too rich on the back-off rate.
I don't think its a PFC issue, that's why i got confused the first time by your post.
But with my Power FC no issues at all.
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