hey crazy,which way do you have your check valve facing?if it has an arrow on it it should point away from the vacuum block.this would allow the block to be under vacuum during normal operation but not allow boost through under wot.
I think thats the way that i have it now, i just put the old y fitting back in to see if it helps i had a t there before. the only thing i can think is that the one way valve is to hard for the vac to open , maybe i should try a new one.
I CANT START THE CAR NOW TELL I GET THE TRANS FIXED.