I pulled the plugs this morning when the engine was cold. No signs of any coolant on them. All looked nice and clean. I changed the cap and rotor when I did a full tune up last month. The stumble was there before and after. It only does it half of the time and only for a second on start up when its cold. Any other ideas? Its not a big deal but I'd like to fix it.

1994 4x4 22RE