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1. Bad Gas. Use only Supreme Gas. NEVER buy the cheap stuff

2. Rangers are famous for a design defect that will require you replace the coil pack and computer simoultaneously. (Same day)

Usually those knocking noises are small little combustion explosions. DON'T let your truck make those noises. If your truck does this anywhere from 30MPH or higher or for extended periods of time, get to your mechanic! You can do serious damage to your pistons.

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