Oh... thanks for the additional feedback. Do a wait and see. Some diagnostic tests should be done before assuming the head gaskets are gone.
Maybe you have a line leak somewhere.
There is a leak down test that should be preformed. Plus compression test.
If you seeing bubbles in your antifreeze you probably have a head gasket leak.
It's diffenately possible a gasket went. Especially the running rough. I just like to verify things before going a head gasket route. Because what caused it? A faulty gasket or a crack in the head?
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7 3rd gens listed in the build thread (2 are parts mobiles)
Build Thread:
https://www.toyota-4runner.org/3rd-g...os-builds.html
Brillo's Bucket Fluid Ex changer:
https://www.toyota-4runner.org/3rd-g...ml#post3358086
Sparks Plugs Wire and Coil Information:
https://www.toyota-4runner.org/3rd-g...on-5vz-fe.html