Thought i had a vacuum leak, but sprayed a crap load of ether under the hood and found nothing. The problem is that the cruise control will not engage unless u got ur foot on the gas and the engine is in the boost and out of the vacuum. It kicks in, but as soon as u get out of the boost and back in the vacuum it shuts off, and after messing with is it throws a check engine light on with an error code of leane on one of the banks, but not both. I know the system is not leane because i monitor it with a wide band AFR gage. Any ideas?