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Purchased my 1999 Ford Mustang almost 2 months ago with about 86k miles on it. I use it to go to and from school. Recently I drove it about 635 miles (one way) to visit a friend. I started using the Speed Control function about a hour into the trip.

After about 4-5 hours of driving it started to sputter as if it was out of gas. I made sure to cut off the Speed Control but the sputters started again. I pulled over at a gas station and let the engine cool down a bit before hitting the road again.

On the way home (again 635 miles) it started sputtering again after about 4-5 hours. I let it rest then got back on the road. About 2 hours later it happened again, this time nearly cutting off completely. 1-2 hours later the same problem and I found myself on the side of the road. I was able to make it home, but I have to stop nearly every hour.

Anyone have an idea on what is wrong? And no, I wasn't out of gas or even close any of the times.
 

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Is the check engine light on? That might lead a mechanic in a direction to solve your problem. Things it could be are, a coil pack getting too hot, the fuel pump heating up and starting to fail. Throttle position sensor, or a mass air flow sensor, then there is also a crank sensor and cam sensor. If the check engine light is own, it will lead you to most of these issue pretty easy. The fuel pump wont turn on the check engine light. The throttle position sensor may not turn it on either. The other issues should cause the check engine light to come on at some point, except possibly they suddenly completely failed and if they completely failed you would be on the side of the road.
 

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Evidently it looks like the fuel system. My main thought would be the fuel pump. It is working partially thats why it is sputtering on and off. If it was the fuel filter it would happen all the time. Its a wake up call. The fuel pump will ultimately fail 100 percent. Its a easy fix.
 
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