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Just purchased this Tahoe, knowing the engine light was on. Dealership said it was this P0455 code and the fix was simply reconnecting a vacuum tube which required dropping the fuel tank; basically $260, all labor. Can anyone tell me what this hose might connect to? Trying to get a diagram...

I just bought an 07 Tahoe LTZ with autoride and am trying to drop the rear for leveling purposes... it got me thinking - would it be possible to simply modify the linkage rods so it doesn't pump up as much, but remain on stock rear springs? Call me crazy...