Jeff, Sorry can't remember the year of your zj...Sounds like the t/c vent is clogged. The trans vent and t/c vent is ran up to the firewall sometimes they wire tie them together on the trans dipstick tube.I've also seen them fastened to the firewall in various locations.
Good Luck
Nick
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Just a 200 dollar cherokee that wouldn't start ..
Ten years later same chrome grille ..
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