Hello, they could help me I have a chevy 98 I repair the machine and when you walk it for a while and then the p0125 code and started to throw a lot of black smoke
That code indicates that there is an insufficiency in the coolant temperature you could have problems with the sensor or thermostat but this I do not think it is your problem or could have a problem with the oxygen sensor or with the emptiness that reaches the MAP sensor or even the reference voltage (5V) of the MAP