Need some help. 355 lt1 stalling issues
 

the motor is a 355 with le2 combo and a4 and madz28 tune. It runs decent but has its issues with stalling when put into reverse or drive from park. I cracked the TB blades but still am having this issue. It once stalled on me in the middle of the expressway and then would not start back up unless i gave it some gas. I have checked the fuel and spark. Another thing is that the brakes get really hard while slowing down sometimes- is this normal. Vacuum at idle is 11.5-12.