1999 Suburban "Starting" issue - has fuel & spark, but will not start ...

[OverRunWithSons]

Wife here writing this up, asking for suggestions to fix our Truck, as it runs great still (at 200,000 miles) if we could just figure this out...

One day it will start up fine, the next ...it causes trouble, has spark, has fuel, will see black smoke out the tailpipe... the other day I got it started after 4 to 5 tries, it spit & sputtered, but got it to work then revved it good...as I recall the smoke looked white...

But husband & son said it was black tonight coming out tailpipe... they were doing this outside in the dark with a flash light..son saw fuel spitting out of carburetor.

Wondering if the Colder temp's could have an effect? (below 32 degrees here).. we had same issue last year this time , changed the cap & rotor/ plugs and appeared fixed... ran fine the rest of winter.. and now it's doing this again.. He bought a new cap & rotor tonight... no effect.. New Battery was put in Jan this year...

Any suggestions ??