84 FJ100 only firing on #4 cylinder

[Chad]

Any ideas what to do would be nice. got new coils, battery.

[andyb]

Typical troubleshooting applies.

Swap the leads between 1 and 4.  Does the hot cylinder move? 
Pull the plugs, do they all have gas on them?

[Chad]

yes they do

[Arnie]

yes they do

Slightly more complete sentence would help here. :-/
Does "yes they do" refer to changing the cylinder that fires, or to all cylinders getting fuel?
If you pull all 4 sparkplugs, ground the outer, do all plugs spark or are some not sparking?

If they all have good spark, and you have fuel to all cylinders, then check compression in each cylinder.  Report all this info back and then we can help.  Hard to guess what's happening blind.

Arnie