gmcjetpilot,

I'd say service the bottom bracket as the grease is likely shot (dried out).

It takes a few tools to do so and I'd say either invest in the tools (and the skills) or buy a sealed bearing bottom bracket and have a local shop install it (my recommended approach).

There are several different ways to do this, each requiring a slightly different tool set.

If you want help, please ask.

TOOLS (for one method) -

Crank bolt wrench/socket (thinner wall than normal)
Crank arm puller
Lock ring pliers/spanner
Pin wrench for adjustable cup