Please help. No power then no start.
 

1989 XJ 4.0 4x4 auto

I'm going to try to explain simple.

•When I got the jeep my tail pipe was rusty with holes. Pretty much only rusty part of the jeep.
Jeep still ran good though.

• I changed the tail pipe by welding it on. Had a few exhaust leak holes around weld so I used JB weld to fix those.

• missed one last hole so I used JB weld to fix the last hole. So all my exhaust leaks were gone.

• decided to go give a quick drive down my road (no tag, yet)
For first 3/4 mile it ran better than ever THEN when I turned around to go back home it lost all power. I put the pedal down and nothing. It would barely go 15mph. I made it back though.

• I let it sit about 5 minutes (upset) then decided to check it out again to see what it was doing again to get a better understanding. It made about 1/10 of a mile and lost all power I decide to turn around in nearest drive way but it cut off in the road.

• I waited five minutes it barely crunk then I went back home and now it will not start at all or it start and dies in 1 second.

I have a thought as to what it is and why it did it when I closed the last exhaust leak but am asking for y'all's input?

No suggestions. Well I'll tell what I think it is.

When I got back home after driving 15mph with no power I smelled a weird smell. My catalytic converter seemed to be really really hot.

So I'm pretty it's clogged. I know it causes no power but can it cause the no start? Also if it is a clogged CC and I unbolt it (as a test) should the jeep start?

What's the fuel pressure in psi?

Not sure but it does have pressure and fuel at the rail.

sounds like coil died to me

But what's weird is it did this after fixing final exhaust leak. So I think some how it's tied to that.

I just tested ignition coil and it tested correctly one way but was iffy the other so I'm going to run to auto parts store and compare testing to a new one.
I'm sure my problem is not coil related but it probably needs a new one anyway.

What kind of welding? Doesn't some of that require you to clam a high voltage electric current to the metal?