well lets see i got a 355 miled built sbc in my truck and i had a 750 on it...duell feed well i swiched the duell feed boles onto a 650 for gass milage and the 750 was over kill.... well now im geting a hess if i nail the gass it will die.... only in gear ... but if i eas it then nail it it dus fine.. could the accelarater pump be set to tight or what else could couse this ... its on a holley