I have been trying to figure this out for a while, any advice would be greatly appreciated. I uploaded a couple of videos to you rube please take a look. Whats going on is, at times the cranking speed is nice and quick, other times it is slow and has trouble starting. I installed a fuel pump cut off switch to get the car to start. Just watch and listen you can see in one video with the slow crank it flooded and I turned off the fuel pump to get it started. The car will always start its just that I have to ise the fuel pump switch. I want to fix it so I dont have to do that anymore.

https://youtu.be/SOdualx_9-o
https://youtu.be/-m6uJ1lg-Lo

 

Check battery voltage and do a voltage drop test on power and ground circuits.