Originally Posted by SXX360

Did you put the O2 sensor in or is it out?

Originally Posted by siggie30

Coolant temp sensor is mainly used while the vehicle is warming up. Once it surpasses the required temp, the coolant sensor has no value (of interest). The O2 sensor picks up, once the probe is about 600 degree's (changes depending), there are other sensors, but going by your specific question, one of your sensors are losing output. You should study the lambda principle if you want to learn about the EFI sensors affects (aptly named "The Brettschneider equation") . Try a data scanner to see if you get any codes.

Originally Posted by InnerCityHillBilly

does it make any difference if it stops after the truck worms up and dosnt happen as often when the engine has wormed up?