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1996 k1500 5.7. Misfire #5 cyl only. Ran fuel pressure -compression - leak down - idk what else. Replaced egr-spider injectors updated version-new plugs wires cap n button. All tests shown great. I read where someone said it’s the power booster check valve. Is this possible ? He said it only affects cyl #5
 

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2000 Silverado Z71 4x4 5.3L 460k+ miles w/ GM rebuilt motor and trans
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I'm not familiar with the spider injectors, personally, but is there a way to verify the #5 injector is opening properly?
 
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