The problem was the crossover tube from the egr valve from the right side of the engine to the left side at the lower part of the throttle body. The mounting nuts had backed off and I must have jostled the tuve enough to allow a very slight vacuum leak that was on ported vacuum that rarely showed up but was enough of a nusance to mess with the MAF sensor readings but not enough to turn on an engine light or set a code.
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Sunday, January 10th, 2010 AT 9:34 PM