[s-cars] boost/accleeration still choppy

[forrest bradshaw]

replaced plugs, boots, air filter and fuel filter and VCG.  Car pulls strong and boost presure builds but under 3/4 to full throttle the acceleration is choppy, not smooth at all.  is this just an MTM 1+ symptom?
below 3/4 throttle the car pulls good and is much smoother.
idle is fine
where to look next?
does not feel like it did 2 years ago with a bad POS, nowhere near as severe

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