Aloha Evox, thank you for all the information. I try to do as much as I can, given my space, etc. I am blessed to have a great mechanic that was once the head/master mechanic at our local Ford dealership. I would always buy parts from this place then some things came up where I didn't think I could do the job as well, a friend who runs the parts department told me about this mechanic they all go to on the side! I couldn't believe it, this gentleman has a lift, etc in his garage! It's pretty incredible and he is so fair with us, that I give him extra. He has saved my wife and I $1000's. So, for the rear strut/springs I just received the large box with the rear Monroe Quick Struts that folks on here seem to like, I will let him install these as he can put my truck up and also look at other issues going on underneath. I have never had a Cel yet for my EGR valve but may attempt to take it off to clean it or put on a new one. I will ask my mechanic by chance, what it would cost to clean it out or replace. BTW I also have an older 96' Powerstroke, now there is room underneath to work there so I have changed my own oil, added in a good oil filter system, I have done electrical repairs in the engine, changed out the air-intake system, etc. I love the room in that vehicle to work, lol! Mahalo!@DaBoss If you want to learn this truck so that you can do some or most of your own work, you may want to invest in a 2007 Ford Sport Trac Shop and Service Manual.
Look around the internet, and sometimes you can pick up a good deal on eBay. I like the old fashion book versions, but some people are fine with just the computer CD version, which would probably be cheaper.
A set of manuals will help you tremendously in learning how to work on your own truck. A good manual set will pay for itself many times over.
Also, I have a fairly expensive ODB2 reader, but my oldest son has this one.
BlueDriver Bluetooth Pro OBDII Scan Tool for iPhone & Android
It's not going to give you everything, but it's simple, and it'll point you in the right direction when something goes wrong. It will really help you keep your truck in tip-top shape, and if something goes wrong can help you diagnose problems in your cars and trucks. You'll be able to come on this and other forums with the trouble codes, which will help people like me help you much easier.