Does it crank over? No-crank usally means starting system. You can manually
block the choke to be always open, but you'll have a hard time on cold
starts and you'll have to let it warm up and take it easy for a bit when it
is cold.

With more information everyone can provide more help. Engine size? mods?
4x4? What have you done to it lately? Have you driven in any deep water,
ect?

Carl

"Trouble starting" is kinda vague, more details.

Assuming you have a V8, both the 318 and 360 have a problem with the exhaust
crossover passage in the heads/intake manifold plugging solid with carbon;
this shuts off the heat to the base of the carburetor and the choke
mechanism won't get hot enough to allow the choke to fully open. Removing
the intake and manually removing the carbon is the only fix.