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Misfire disappears at high RPM in my 2014 GMC Sierra 1500

  

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Misfire , good compression, good spark , misfire disappears at high RPM  complete tuneup new injectors, new plugs , new wires , and coils good , compression 160-180 psi at crank  60 psi at run  only cylinder 8 


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Test for vacuum leaks. Just search SCotty's youtube for videos how.


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