The P0128 is your thermostat. Your engine isn't getting up to temperature, is probably stuck open.
P1680 has to do with your pedal position sensor. Either way, your PCM either needs to be recalibrated by the dealer OR replaced. This depends on where your VIN # falls on the list of the technical service bulletin that is out there.
I have a 2004 trailblazer, the rpm's go down or truck completely turns off when I come to a complete (like a red light), I am sick of it... replaced pedal, throttle body and still doing it.... please help.... [email protected]
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