The 1st Gen Vibe/Matrix employed a rev-limiter on warmup. I know this might be counter-FE-intuitive, but try this...
At the high idle, try an attempt at acceleration toward redline. If it holds at lower RPM (3000-4000RPM or so), then you know it has been fooled into thinking that you're still warming up.
It's one of the few vehicles I've driven actually prevents high RPM operation when cold.
RH77
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