m44 crankcase valve

[jimmyspeed]

hey, I'm having great trouble with my dirty6 for years it has had a slight burble/misfire to the exhaust note. Its had numerous problems with the idle bouncing and cutting out.

I've just swapped the crankcase vent ccv/pcv and am wondering if anyone knows how to physically test the new part

should i be able to blow air through it both ways ? as i can on both the old and replacement part

any help appreciated!!!

things I've checked renewed

leads
plugs
coilpack
battery
injectors cleaned and new o-rings
camshaft oem new
crankshaft within resistance parameters
maf cleaned and tried with spare
new gaskets to head and inlet split

thanks