During startup, after running the car for a little while then shutting off the car for like 5 minutes, my car sometimes doesn't wanna start or it seems like it won't hold the charge when i turn the key. Or sometimes when it's cold, there'll be a grinding noise then the car will start. Could it be the starter?? Maybe i need new spark plugs?? I have a 2001 2.5rs...can anyone help!!!???