[s-cars] Weird new stumble

[Neil Swanson]

Hey all,

I haven't had alot of time to look at this problem yet
so till I do I thought I'd run it past the list.

New stumble, of course intermittent, very
intermittent.   First felt with car all warmed up, on
highway at @65mph.  Car suddenly ran rough but would
clear as soon as any throttle is applied.  Didn't do
it again for days.   Later felt under same conditions.
 Also did it once just off idle.  Weather doesn't seem
to make any difference.

Today it did it twice on highway and I noticed the
boost gauge just around "0", just on the crossover
point from vacuum to boost.  I can't get it to do it
anytime I want.

Also noticed lately the slight "honk" from the BPV
(stock 710N)    every now and then when conditions are
right.

Plugs are very new.   BPV isn't that old. No codes.

I wish it would do it all the time.  I'm not thinking
POS as they seem to work till they stop with little in
between.   Plug connector?   Nah I think I'll find
something else. 
 Only common thing felt so far is the boost gauge
reading when it happens and the throttle just barely
cracked when it happens.  Maybe I'm feeling a huge
vacuum leak when the BPV is going from vacuum to
boost.

Any ideas?  Anyone chased the same thing?

Thanks

Neil