Just went and tried the $75 dollar tune from Eric -- and everything seems good. I can't say I notice any power increase, but is running better/smoother and no check eng light so thank you very very much to all you guys and to Mr. Brooks! Case closed.
Jared

As for installation -- no, if you read the mustangforum post I originally reference you'll note that I'm just getting into this. I just bought the car "as is". I have no personal knowledge about what's on it. Just taking sellers word. Turns out the seller is not to knowledgeable either unfortunately ...

ah, i just found something out. I emailed the WMS guy, cause in fairness I really don't know what's on the car, just taking the sellers word. Turns out I have a 95mm WMS. I'm going to have Eric Brooks <[email protected]> do a custom tune for me instead of buying the SCT. Do you know anything ...

Hrm, well that's unfortunate. I wish you could tell me what the something else is. But since it seems you can't, I'm forced to go spend more on another tuner. If you think of anything I could try, I'm all ears. Plus, I don't love that the WMS is a 91 octane, why isn't it a 93? Seems goofy to me.

You know, I also see there's a generic 93 octane performance tune. I've not tried that. To change the tune I have on there I don't need to manually reinstalled the original do I? It will do that when you click on a different tune? Do you think this is worth trying?

This is what I have btw:
Magnaflow 3â€

Any further advice before I go and spend $400 on a SCT from American Muscle? Everyone else I've talked to so far says this is the cheapest way to get a decent tune. I'd rather you send me a custom tune for free (or reasonable price), but doesn't sound like that's an option. I've asked around, but ...

Is there something I can go visually look for, or email you a picture?

So, how can I find out? Are you thinking there's nothing wrong with the diablo tune? (I don't know personally, but people are now telling me diablo tunes are no good. Is that true?)

When you say a small leak ... leak in what?

It says:
"WMS 80mm Kit"

and on the next screen:
"calid: FBJR3G5HEX"
"vin: ...."
"..."

Exact error codes are as follows:
P0171 System Too Lean (Bank 1)
P0174 System Too Lean (Bank 2)
P1000 OBD System Readiness Test Not Complete

1. u7140
2. latest (u7140_stang_05-9r04)
3. Ford Mustang, 2005, GT

I started a topic here at the mustang forum, but have not had any luck yet:
http://mustangforums.com/forum/4-6l-v8-technical-discussions/601648-to-tune-or-not-to-tune-2.html

I just realized you guys have a Diablo forum, so cool ...