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Discussion Starter · #1 ·
Well guys The truck is running horrible. Rough idle and HORRIBLE sputtering and shutter going down the road. Truck is a 1990 F150 300 straight 6 EFI. My thoughts are it jumped timing but thought i would get yalls opinion before i just throw a new motor in. Truck has 300,000 miles with no motor work besides replacing spark plugs and stuff like that.
 
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