2000 Ford Explorer 2000 Explorer P0171 & P0174 DTC, run

When I start my Explorer in the am to warm it up it runs very rough and sometimes dies. The check Engine Light is on. It has also has a problem that I'm wondering whether is/not related where it randomly starts idling very high for no reason - a problem which I am guilty of ignoring for quite some time because I am a girl without the knowledge & means to repair it & it didn't present a significant problem to me other than being rather annoying.
A friend of mine used a scanner and got the DTC P0171. He started trying to help me fix it by replacing the vacuum hoses that lead to the EGR solonoid because he said they appeared to be worn. He then reset the Check Engine Light. It briefly ran significantly better, but started doing the same thing again and the Check Engine Light came back on.
He reset the Check Engine Light again and it ran better for a little longer time, but when I started it up the next morning the Check engine Light was back on. Now, when scanned, both P0171 & P0174 come up.
I was reading thru some of your other forum Q & A's & saw that it had been suggested that when both of those codes come up that the MAF may be contaminated or that there could be vacuum or exhaust leaks.
One other thing is that I also recently had another friend replace the fuel filter.
I'm a girl with a limited amount of money who lives way up in the mountains so I'd like to check out as many options as I can before having to replace any of the more expensive sensors or have to run up and down the mountain to purchase or exchange different parts.
I would greatly appreciate any advice anyone can offer so that I can pass it on to my friend who is trying to help me.
Thanks so much, Cyndi