No power, it will not go over 28 mph

I haven't read all the links that you sent yet. After I sent the message last night I drove, I had to leave and my trouble light is staying on constantly, that's probably why the jumper didn't work. It's been several days since the first check information being number 11 and 31 trouble codes. #31 is EGR valve sensor receiving low voltage and that was the code explanation and since I just replaced it over a year ago I wondered if there was a low voltage issue in my system leading up to that sensor. (That sensor is under lifetime warranty but they cannot find it in the computer under my name, so I've been looking for the receipt for 3 days). Now I have another problem and I need to send you what I can find out about that, the check engine light is constant, no blinking when I drive, no blinking with a jumper.

You would think that in Phoenix the fifth largest city in America, I could find an old-timer who works at a shop but I haven't. I did however find an Innova 3145 on eBay for $30.00 and for an additional price there's a extension so I can read the codes while inside the vehicle and that's probably what is 61 year-old backyard mechanic is going to have to do because I'm on my own since my income stopped suddenly, no notice a short time ago.
I added a note about what I am driving but it doesn't look like it sent -- my chassis is a 1989 Ford E350 7.5ltr fuel injected w/ C6, but it's also a Winnebago 27-foot Minnie Winnie, which narrows down again. I need a mechanic who has room to work on it. And basically I'll be living nowhere until the courts sort out my mother's probate and I receive one of her four houses, and that's another story.
Right now it would be perfect to find an old-timer mechanic who needed a secretary or a bookkeeper.

Roy - (I hope) this is Tamara with the RV sitting on a Ford chassis 1989 e-350 v-8 7.5gas fuel injected engine and C6 tranny. Hope you had a nice Thanksgiving.
Ive done code 31, EGR sensor - but had to drive it before that -- (note, problem is probly a new one) the check engine light came on and hasn't gone off. So can't do the OBD-1 (using jumper wire-) test to troubleshoot.
Can you give me a list of things that may be caused from?
1. Check engine light remains on.
2. Engine dies often and idle now inconsistent - unbalanced. (Checked wires/plugs already)
3. Very different smell from exhaust.

Tamara

Also - the way it now sounds. I dare not drive it long enough to reset system to test with new sensor.

The OBD-1 test said 31 - low voltage change sensor - I did.
But the check engine light came on before I changed sensor and hasn't gone out.
It appears to be from an unrelated problem.

The cat and fuel pressure test? No - I can borrow the tool test fuel pressure from AutoZone - but I don't think I can do it by myself.