It started last thursday, I went to start my car and it just kept cranking, so i tried pop starting it, nothing, right after that it started. Same thing happened saturday morning, then today i kept trying and it woudnt start, then after work it started right up. My step dad said it could be a dead cell in the battery? What do you think

 

could be one of many things, clogged injectors, not recieving a spark, ect...