I dont know if it will help but my truck did that and we cant figure out why it startes but runs backwards and then dies and wont fire it just cranks. we thought it was vapor lock but i dont know. maybe ill check to see if any wires where pulled on mine.

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94 Mazda B2300
jvc head unit scosh hds and xplod speakers also have 2 12 inch subs in the back.
american racing directionals on 30/9.5/15s
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