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My name is ***** ***** I am a professional here at Just Answer. I noticed that your question had not received a response and thought I would see if you still need help with this.I apologize for the delay and I hope I can still assist you with this here.
it sounds like there is a couple of different issues here.First with the fob,if this is only occuring with one fob itself this can be the fob itself at fault needing replaced.I have seen the fob fail in the past before.
With the issue with the idle hunting and idle motor code here this may be a fault with carbon build up in the throttle body needing cleaned or a vacuum leak from something like the intake gaskets leaking needing replaced.I would have the engine checked for any vacuum leaks and if any are found they will need repaired.If this is or was checked and found o.k. the intake should be smoke tested to locate any hard to see leaks like the intake gaskets leaking.
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