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VINs are sequential until someone proves otherwise. Please, let's not drift off into never-never land. Let's stick with what we have, which is VINs and build dates.
A dip in the idle of 800 rpm to 500 rpm when the a/c kicks in does not seem like a problem unless there is shuddering and almost-stalling and cel codes. It may just be a very lean idle design, perhaps in order to achieve EPA goals. I do not know.
sho220 is concerned that the "idle dip may lead to worse things." This is a good reason why we should list milage in each case, so we know where we're at.*
Z06 speaks of almost-stalls and shaking. I would call this is a problem.
*Question: We have reports that, on some cars, Toyota is replacing cam sprockets and sensors, among other things. Can someone explain why these would fail gradually over time rather than fail suddenly? One post said that his car threw a cel at 91 mi. That would be an example of sudden failure. But most report that the idle dip develops after at least 500 mi., which seems more gradual than sudden.
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