Ok so I have an 04 Mustang and just recently my car won't start like at all if someone tries to jump me ...no dice . It will only start if I use a portable jumper but the main issue is once I get her going I'm fine all day if I'm moving like on the freeway but any red light or stop sign if I don't go in neutral and rev my engine I have the VERY HIGH chance of everything shutting off which has led to countless times of me in the front of an intersection popping my hood and running to jump the car with the portable jumper and get back in time to rev the engine. I have replaced the battery it is brand new I replaced it twice and it is not the alternator when I unplug the battery it will keep running once I jump it. I also recently removed and cleaned my idle ignition valve I believe... The only other thing I can think from what I have read online is possibly a fuse or more likely something I have discovered recently is a problem with my anti-theft light I do notice that once the car shuts off and once it shuts off there is like no power I have to jump it again but that anti-theft light will be rapidly blinking even though I don't have power to even roll up my windows until it just completely runs out of juice I'm really not trying to spend a bunch of money and parts and repairs if it's something as simple as a problem with the anti-theft light I did get a new key like 6 months ago (I think I left my keys in the door and someone snagged them) I lost my beeper thing like a year ago but no problems like this at all until about 2 weeks ago and it is just been hell since somebody please help me!!! I am currently parked on the street outside of the park because once again my car died and now it is not even jumping with my portable the jumper is just showing a red. Exclamation point!