if i shut off my car and start it immediately back up, it starts fine. same thing if i shut it off and leave it off for a couple of hours. but, if i shut it off, run into the gas station or something and then try to start it, it wont, in fact, it wont even try. it used to just do this if it only sat for a few minutes before restarting, but last night and tonight, i had to let the car sit for 2+ hours in order to restart it. and it doesnt happen on a regular basis---one day it does this and one day it doesnt. im just sick of getting stranded while waiting ofr my car to decide to cooperate. any suggestions?