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I doubt an intake manifold leak would cause a no run issue, but would cause poor running, unless its severe and allowing coolant in. As someone else said, check your plugs.
One way to check for an intake leak (or vaccume) is to spray WD40 (carb clnr & starting fluid work too but less advisable) around the connections and look for an rpm change.


I know for sure that a 3.0 won't run especially if it gets enough air from the leak that the VAFM flapper won't move. IE you wont get any fuel into the engine without the flapper moving.

(aka suprathepeg, aka Sean)
89 v6 SWB truck "BLACK BEAUTY" EB valves, P&P head 30 over.
95 FZJ80. Lifted. locked and rollin on 33s (my dream machine)