How to Megasquirt your 3G Hemi

hey i have a question about the tuning of megasquirt. i have an 05 5.7 hemi and i got the gold box with harness and it also came with default tunes on a flash drive i had to install via laptop.the tune it has is a 6.1 VVT (mine has no vvt so i turned that to disabled). it fires up fine but my problem arises when i use the throttle. i have a vacuum gauge hooked up and when it idles it sits at around 19-20 of vacuum. if i go right to throttle hard it loses all vacuum and dies but if i slowly go into the throttle and watch my vacuum gauge and dont let it go to low i can get it to rev.