Hiccup @ 4500 rpm = bad AFM?

[525_M20]

Hi everyone,

I just developed an intermittent hiccup or hesitation at approximately 4500 rpm. I'm kind of hoping it's the AFM because I've got an 027 big six meter coming, and 19# injectors waiting. I'm also eyeing the Mark D chip.

What do you think?

[blazing]

Mine does the same at 1500 rpm never figured it out.
I will be watching this to look for replies.