Fast Idle Woes Continue

[Trevini]

Could be mixture running too lean… that could be caused by co level set too low, faulty temp sensor forcing ecu to lean off the mixture and probably a few other things as well. 

 

Regarding the co settings, it has been known for one or both cylinders to “reset” to 0 or a minus number when trying to start if the battery is very low. I’d look at that first and then go for the engine and ambient temp sensors.