Holy worn cap and rotor batman! ('91 Foxie)
 

So I changed the spark plugs and wires, along with the dizzy cap and rotor on the '91 Foxie and wow! I honestly didn't believe they could get THIS bad! Lets hope this gets me out of my 5-9mpg I'm getting and up to around 15-17 like it should! I also broke some tiny hoses under the air intake hose, one was black, and the other was white, no idea what they were, but no CEL and performance doesn't seem to be effected.

The car is also so much snappier it's not even funny, I'm so glad I took the time to do this.

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Picture of broken hoses. They are so brittle they just snapped, I wasn't being rough or neglectful.

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Sadly, I've seen worse.

The tiny lines are vacuum lines, but I dont know what for. I would strongly suggest replacing them.

I've seen worse as well. It's amazing how bad they can get and still run.

Bad cap/rotor on a fox body reminds me of my friend's old mustang. He bought an '86 SVO and was showing it off to me. He got on it a bit and it instantly died! We pulled over and popped the hood... The rotor had exploded! Pieces of the cap and rotor were everywhere. I think it was just caused by a loose screw on the rotor and an new cap and rotor and it was good to go.

Yea they are to the emissions system, I'll be buying vacuum line tomorrow and fixing it.

LOL! I don't know about his, but mine was showing clear signs something was wrong. It was missing really bad, wouldn't Downshift right, slew of other things. Now that I replaced it, I barely have to touch the throttle to get it to Downshift, and it's running way better in pretty much every way. Tomorrow I'm clean the mass airflow sensor, throttle body and IAC. Then it's onto 3.73 rear end, 5-lug conversion and completely new suspension from the ground up.

Reminds me of replacing my mom's (rear) brake rotors and calipers because the pads fell out on the road and she continued to drive it for a day or two. If I were you, I'd be going through the brakes next!

Yea brakes first, then suspension, 3.73 rear end, then 5-lug conversion. If the 5-lug conversion kit wasn't 1,600$ it would be a little higher on the list but, yea...

That's a lot of money. I could sell my Civic twice over to fund that! :p

I could buy 3 POS KIA's for that!!

I'd look around some more... basic 5-lug kit is only $400:
Alloy USA Complete Mustang 5-Lug Conversion Kit - 28 Spline KIT (87-93 5.0L) - Free Shipping
And if you are fine junkyard scrounging, you can probably cut that in half.

These are simple cars with cheap, plentiful parts. The high-dollar stuff is not much of an improvement over the cheap parts.

For $1600, you could probably find a beater SN95 Mustang and get your brakes, lower gears, and 5-lug conversion all at once!

It's easier and cheaper to plan it all out and try to hit em all at the same time.
Is there a whole rear end assembly from another mustang or other car, that you can swap in that would already have the ratio, lugs, and brakes? Changing or modifying any rear suspension components becomes ridiculously easy when there's no rear end in the way.

My 3rd gen camaro had different front and rear wheel offsets, and a limited 2.77 that performed like an open. So I got a new gear ratio, limited slip that actually worked, and right width for a common whell off set, and it all had 1/4 the miles for $500 At the same time I put in subframe connectors, which boxed in and welded to the rear control arm mounts, replaced the control arms, custom boxed in the panhard rod mount, replaced the panhard rod, and had I wanted to, the springs were already out.

But yea, it was still just a money pit. Streetbikes, dirtbikes, racing modded up quads... We're all much better ROI in terms of fun to burning cash ratio IMO