I am new to this forum. I have a 94 K1500 Full Size Blazer and I got up to go to work one morning and a I heard a knocking noise when I started the truck. When I would speed up to 20 the knocking noise would get faster and faster but after I get over 20 mph then the noise goes away but when I start to slow down again at a stop light or something the knocking noise will come back. Wanted to know if anyone else has had this problem or what I can do in order to get rid of this knocking noise. Thank you for your help

 

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