i don't now call the cable people or fix it candel
ds lite wont but dsi will
1990 gmc p/u 5.7 wont idle showing code 12
Thermocouple is probably bad and needs replacing.
your truck wont idle correctly when its cold, because its cold...and nothing runs correctly when it's cold. your truck wont idle correctly when its cold, because its cold...and nothing runs correctly when it's cold.
Usually the spark plugs or the timing.
Try the idle air control motor
the idle solinoid may need changing, or its power source is not plugged in or working. If the solinoid is not powered the carby wont know where to idle, it will drive fine but wont idle when you pull up at lights ect.
u dont set the idle the ecm does the setting througt the air idle conrtol. If it wont idle u need to replace the aic motor on the th0rottle body!
The A/C idle compensator solenoid is not functioning. This should be located next to the carb.
possibly a vacuum leak, low fuel pressure, or the idle air control has failed,
Idle Air Control Valve....if this breaks you car wont idle properly....the rpm will go up then down all the time when idling
Bulb in dash or sensor at t-case.