Total newbie here. I have been reading posts here as guest trying to understand a 4wd drive '94 chevy s10 with 4.3l tbi that I bought this winter. I...
Could be a defective oxygen sensor, exhaust leaks upstream of the oxygen sensor, thermostat opening at two Low of temperature, or even late ignition...
Missouri, southern Ozarks here. Welcome. Trouble codes and any other drive symptoms would allow us to help you. Make sure your O2 is working properly...