Alright my K5 acts weird once and a while and doesn't like starting. It cranks really slowly like the battery is dead then out of no where cranks fast and starts right up. I'm rebuilding the truck and the only things in the engine bay that haven't been replaced at one point or another are the radiator, starter, and alternator so guess what I'm replacing? Going 4 core, mini high torque starter, and new more powerful alternator I think. Also probably putting an MSD 6AL on her. I'm told they help start ups. Think all this will fix the problem? The Battery is a brand new Optima Red Top and I don't have a voltage gauge but had my alternator tested at Auto Zone and tehy claim there is nothing at all wrong with it.