2006 Ford Freestar Q&A

2006 Ford Freestar Question: we have a 2006 ford freestar at shop that under heavy acceration it will surge

normal driving it is fine. plugs,wires ,fuel filter and flow are fine.cleaned intake,injecters and vavles. no codes under globalobd2 or manufature specic. looking for suggestions possibily missing something. -
Answer 1
maybe a vacuum leak -
Answer 2
Have you driven / ridden in it with fuel gauge and scanner hooked up? -