So Im slowly getting bugs worked out in truck. New CPS, mech fuel pump, injectors etc. It cranks slow. Even after tech installed injectors he said it cranks slow. Cables look good. Im trying to figure out a effective way to fix it without throwing money away, it always starts. Its only got 650 cca batteries in it. Is there anything wrong with buying 1 new 800+ cca battery and see if it helps? If it dont go to cables or starter? Batteries are pretty new but only 650 cca. What do you guys think?