I had that code pop up about two months after installing my hfc's. I thought that it was due to the O2 sensors and the new hfc's but it turned out that the cause was due to a slipped hose clamp on the short ram that attached to the throttlebody. The ram slid out of the coupler and the engine was sucking in unmetered air. I replaced the flimsy coupler with a nice silicone hump coupler from Z1 Motorsports and hanen't seen that code since.
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