dyno now car turns off

[eclipsemustang]

i just had my car on the dyno to tune it and long story short we did about 20 pulls and after all of those we finally realized my safc II couldnt compensate for the 650's, so im still running rich but now my car will shut off after i get into boost than push the clutch in.
ex.) if i take off and boost and than get up to speed and want to coast so i push in the clutch instead of going back to idle my car shuts off, but if i just shift and dont coast my car runs fine. anyone have any idea whats going on?

 

[talon187]

do a boost leak check. check for bad grounds and check your cel coould be your 02 sensor if so replace it. who ever turned your had no idea wtf they were doing. like said above you were running way to lean. with 650s and just an safc2 you should be able to get a decent tune. you wont get pefect but decent. your a/fs should be around 11.5 to 10.9 depending on who you ask. my car runs 11.5 at full boost