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Could be an Accelerator Enrichment tip-in issue with your EFI tune. I'm battling the same issue with my wife's SBF 410 blower car...spits and sputters for a bit then goes like hell.
 

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^^^^X2^^^ Sounds like it needs enrichment at tip in. Basically what a double pumper carb does when you snap the throttle blades open, the shot of fuel gets you over the lean stumble. The EFI obviously doesn't care about loss of signal to the boosters but there is still a lot of air all of a sudden that must be dealt with. Two areas to check would be ROC tps fuel table and accel enrichment table. Some systems use different names but the functionality is basically the same. Hope this helps.
 
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