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03 svt random shut off while driving ?

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I have an 03 svtf
While driving it just randomly shuts off. The engine light, and battery light come on.
Ive just been popping into gear so I can keep driving.
It does it at random speeds and in random gears.
Is it the clutch slipping? I was told its because I run 205/55R17 instead of the stock 215/45 is it that sensitive?
Anything suggestions on what it could be or how to test something that maybe causing the problem.
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