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1) Seafoam couldn't hurt. ATF will wash a lot of crud into the oil pump pickup, so I wouldn't recommend it.
2) As for causes, they usually just wear out. If they're stuck, the Seafoam should help....

That will tell you if there is a leak, but not where the leak is.

Get some UV dye for coolant systems and put in there. Then hit it with a UV light to see if there's an external leak. With an external leak, depending on where it is, it could well burn off before...

You might just try adjusting the rocker arms a bit. After all those miles, there will be some play and noise, no way around that, but if you tighten them ever-so-slightly, it will mitigate much of...

Sounds to me like it might have jumped time a bit.

If it keeps up, you might have some bees under there. :D

See if you've got any codes. The computer actually does have trouble codes for both a failed ECM and PROM.

Shouldn't be a problem.

The plug already grounds against the block no matter what, haha! That instructor must've been in the wacky tobaccy that day.

You'd probably be better off with Flowmasters or similar.

Not hard to do with the right fittings. But why?

Jack it up and shake the front wheels back and forth to see if there's any slop. The rebuilt gear box raises a flag for me. If that's not it, you might look at the intermediate shaft between the...

Grease, and plenty of it.

You might want to have that flex plate checked out. It could cause this problem.

I'm thinking it's the ignition module as well. If it doesn't give a signal, the injectors won't spray.

The wiper linkage? Hit the junkyard, man. Any 73-87 should do the job.

Check both your main positive cable to the starter, and the main ground cable to the intake. I'd bet one of those is a bit toasty.
If it's not those, then you'll need to check the circuits one by...

Look, I'm not trying to cut you down here, but please speak clearly. I'm having a lot of trouble understanding your post, because it's a massive run-on sentence.

How many miles does it have on it?

There's no kit, per se, but you can take the old o-rings to an O'Reilly, and they should have a box full of them in back.

It definitely can be a bad IAC. My 1994 Suburban was almost impossible to start without putting my foot in it, and it would sputter around at about 500 rpm, blowing black smoke, all sorts of nasty...

Could be the fuel pressure regulator. They go out relatively frequently.

Interesting. I suppose it could be the turn signal switch, then. The hazard switch's mechanism isn't directly connected to it. Or it could be a bad connection somewhere. What you could do is...

The turn signals use a three-prong flasher, not a four-prong. You switched the wrong one.

What's the year and model?