when i first start my car my idle is good and vac is from 18-22.after i drive it for awhile doing some higher reving,my idle then sounds like freakina tractor and vac is at 10-12 abd the rpm's drop.my car is untuned at the moment with stock injectors ans vortech fmu,as well as a 255 lph intank if that has something to do with it.thanks for the help

 

well ill answer my own question...it was the tps sensor