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1991 Dodge D150 Question: How to fix my knocking engine?

 

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JJsDodge, Belvidere, IL, March 20, 2012, 11:06
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The truck starts up and runs fine, but when i get over 20 mph the engine knocks hard and it keeps knocking when I speed up and when it gets past it, It starts to run fine again. Not sure what to do.

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