speedometer

My speedometer quit working, the check engine light is on, and the car will not idle, unless you rev the engine up first then it will idle fine. All this happened about the same time. It is a 97 Neon 5 Speed manual 2.0

Any suggestions?

thanks Kool Aid

For the speedometer, you gauges may need to be resoldered. You can do the key dance to pull the codes from the PCM. I'd bet you need to change the plugs.

* Mod Statement* I know this post may be old, but I am trying to answer the questions with no/wrong replies, to get some useful info out there.