Answers: Each and every one of those items is a more or less serious problem that needs to be address. The first code is the easiest, this is being cause by a clogged up intake and possibly a bad IAC sensor problem (depends on how dirty it is). This is where you will want to start....adjectives of your problems are being cause by carbon.
I would start by cleaning out the intake and fuel system. You can do this at home cheaply or take it within for a nominal charge. Remember to change the atmosphere filter, thoroughly spray down the intake (inside, with the butterfly open). If you're husband is identifiable with automotive procedure he should know what to do. The fuel filter wants to be changed as well, an injector cleaner requests to be run through the fuel tank, etc.
This may or may not clear up the first and ultimate code. If it does not the sensor will have to be replaced (or removed and thoroughly cleaned) to clear the code.
The RPM is rotten at idle because of the EGR downfall and because of the clogged/dirty intake and fuel system. A good tune-up would for sure be in directive.
The EGR flow is most likely human being caused by a stuck EGR tap. It can be removed and cleaned well surrounded by an attempt to correct it, if this does not solve the problem it will have to be replaced. This is slaughter your gas mileage and driving the computer crazy!
The code on cylinder #1 could be caused by a little items but is most likely experiencing a loss of compression. The rings are worn, grease and pressure are getting through. This is not something that can be repaired easily.
In your situation I would recommend a complete tune-up, complete fuel system repairs, EGR maintenance, engine flush, and replenish with a premium brand glorious mileage oil.
I hope this help!
Fortunately, replacing the EGR unit and inspecting the rest of the intake many and mass airflow sensor will more than likely also pilfer care of the low rpm. Depending on the age of the vehicle and other factor, I would simply suggest a new set of spark plugs, and inspect the spark plug wires. In the event that the wires are doubtful, shift ahead and replace them as well, as they are relatively inexpensive. The EGR part can be a little expensive, and again, dont forget to inspect the rest of the EGR system as in attendance can be other leaks due to the pipes rusting out and getting holes surrounded by them. The first item of the air charge temp sensor can be a sensor or a doomed to failure wire. Do some cautious checking to make sure on which problem you do enjoy. Good luck.
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