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Did you ever come across this post:
http://forums.swedespeed.com/showthread.php?145137-P0171-System-Too-Lean
Check your service records for PCV work.
You could plug in your smoker to the oil dipstick to check for PCV problems. The intake manifold vacuum will probably not work as some of the valves to the exhaust will be open and the smoke will just go out the tail pipe.
Also check the intake air connections and make sure all of the clamps are tight.
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Keeping it running is better than buying new
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