Misfire cylinder 7

sheedmufee

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I have this problem. I changed the wires, plugs and coil on my 06 envoy denali and it still saying misfire. Can someone please tell me what else could be my problem. Thanks.
 
G

G-316003

AFM failure, one of the lifters has failed.
I just had this exact problem and didn't think anything a lifter being a problem. Rebuilt the motor THEN found the lifted was bad after we put the motor together. AFM lifters are expensive too and notorious to go bad
 
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