Whistle at idle - vacuum leak, induction side

[rpalai]

Hello. I have a 2008 mint 2-Dr Liftback with a 5-speed and the Blitz Supercharger system The car has been fantastic for the past several months, really ever since we got it in 10-08. Nice power with the Blitz blower and never any probs. Now, all of a sudden it keeps setting the CEL and giving me a DSTC P0171, which means "lean condition" detected. Additionally, I notice that whenever I come to a full stop, the idle RPM's drop way down and it wants to nearly stall, but instead it shudders for a second or 2 and re-adjusts the idl up to about 500 RPM's (I have a factory tach cluster in mine) and that is mostly when it sets the CEL. Not every time, but often. So, I believe I am having the same problems as the folks who reference a lean spot at idle. I am stumped. l can NOT find any vacuum leaks anywhere. Any other suggestions. I have a Scangauge II that I use to re-set the CEL in the car but still, it is a pain in the butt to have to keep re-setting the CEL all the time. It happens too often. Otherwise, the car sill runs GREAT and is a lot of fun to drive. Good economy even with the Bltz. PLEASE HELP ME WITH THIS CEL PROBLEM!!! Thanks. RKP