So today I finally got the correct fittings for my BPV, and hurried to put them in and install it. The stock one was whistling under boost as it leaks. Now, however, when I let off the gas, the AFRs climb and peg the top end while the engine slows down (clutch in and foot off the gas). If I engine break it pegs high (as it should) but when I either stop or put it in neutral it stays pegged for 1-2 seconds. If while parked I rev, it fluctuates as it should, but when I stop revving and allow the engine to slow down, the AFRs climb to between 18 and pegged till back at idle for about 1-2 seconds.
I am assuming this means that the BPV is not releasing all the pressure or staying open at vacuum like it should. Am I correct in this assumption, or is this normal and I just never noticed cause I had boost leaks that are now corrected?