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Hey I am new to the forum. I recently purchased this 99 Mustang (65K original miles) and it has been running pretty good until I swapped out the headlights. The previous owner had led's and the lenses were all crapped up, so I replaced them with the Halo-LED with the standard bulb. I am not sure if this is what is causing the issue but while driving the fuel cut off at idle and I thought it was a fuel pump. Mechanic said Fuel pump was fine.

Two days later I get in the car, completely dead. I jump start it and drive a couple of miles and I lose fuel to the engine again. Luckily it started again but a few miles later ALL power shut down while driving. No hazards, nothing! I jiggled the positive terminal and it started again. Definitely an electrical issue, not sure if the new bulbs are causing a draw issue with some kind of relay (I am not an electric guy).

Has anybody ever experienced this? Also could a dead battery in the key fob cause this (causing the factory alarm to engage)? I brought the car back to the shop and then realized this and put fresh batteries in the fob and left it with him. I would really hope this is the issue, but I would rather explore every option than get stuck in the middle of a highway again.

Thanks! Any helpful replies would be great.
 

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You have an intermittent open in the car

Unless you can reproduce it, will be fun to find
 
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