96 Jeep Cherokee

Sounds like the Air Idle Control Valve is unplugged, or leaking vacuum.

Thank you. I'll let you know what problem was once it's fixed. It's over our heads so he is taking it in to get fixed.

Thanks, it's always nice to know.

My friend got his Cherokee back. They said that the intake manifold gasket was messed up and that some of the bolts were missing. I would have thought that it wouldn't have started. Why would that make it rev up like it was floored? Hope this makes sense to you. I used to work on the older stuff and still do brakes and small things but motors, tranny for get it. I'll stick to plumbing, been doing that for 40 yrs.

That makes sense as the computer is supplying more gas threw the injectors, cause the 02 sensor was reading a lean condition telling the computer it needs more gas to try and keep the air/fuel mixture at a 14.7% optimum mixture. Its like adding oxygen to a fire. It is the throttle body that is designed to be able to supply the right amount a air flow to mix with the fuel. Any other source of vacuum screws that up.

Thank you. That makes sense now.