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How to fix my knocking engine? on 1991 Dodge D150

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.

Asked by for the 1991 Dodge D150
THE TRK IS OLDER GET A PRICE ON A GOOD USED ONE INSTALLED THAT WAY YOU DON'T EXCEED THE VALUE OF THE TRK