My thought exactly.Might be talking about the flap under the hood vent?
That's just not so, but it also doesn't address your problem.Its function is to release manifold pressure so it doesnt wreck your engine. When your throttle closes all that pressure is trapped so it needs a way out or it will surge into the engine and cause damage to engine and turbo.
"When you've eliminated all other possibilities, whatever remains, however improbable must be the truth."Well, as Sherlock Holmes once said, once you've eliminated all the possibilities what remains is the impossible.
Ya know...now that I'm tapping into the memory chips in my head...there was a thread on here a while back where someone was having a similar issue. Turned out he was missing a screw underneath the throttle body somewhere. It's underneath like you can't see it unless you have a mirror in your hand.Well its nothing vacuum line related. Im pretty sure now its either the gasket between the throttle body and manifold, or the manifold gasket. It runs great all the way till the car is almost warm, and then it acts up. So the different expansiin rates betweenbthe aluminum and steel must push something apart enough to cause a leak. I checked all vacuum linss warm and cold unplugged the aic while running and it just made it really bad, so the aic is keeping the car as steady as possible. Sooooo off with the TB and manifold after I get back.from Vegas.