Originally Posted by Matt5.0
Will an o2 sensor cause a ruff idle? I jumped my car today it ran great, reved normal, then about 5 min later it dropped rpms and ran like crap would not respond to throttle, and hard to get it to rev over 2000 rpm. Wanted to know if bad o2 sensors could cause this. If not what should i look into.
Possible like dreamstang said.
They send signals to your ECU to help it determine the proper air/fuel ratio.
If they are not working properly the engine can run too rich which will eventually wash down the cylinder walls enough to damage or destroy your engine.
Your description sounds more like a possible timing or fuel supply issue.