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1999 GMC Sierra 1500 z71 4x4 5.3l

It starts fine but when I'm driving at speed and go to excel it's like it hesitates or choking out or something. I let off the gas and puch it a little harder it seems to be ok. But it shakes the truck when it does it. It happens usually a few times every time I drive it. Any ideas? Thank you for an help

Posted by Ryan S on

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john h

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When was last tune up ---

Posted on Nov 24, 2022

Larry Ng

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Ran for 23 years and only failed just today or?
that is spark(violent felt) not fuel.
if you'd have scanned the pcm OBD2 PORT AS IT misfires
THE pcm TELLS YOU WHICH CYLINDERS MISFIRED.
DCT P03XX .
ARE THE SPARK PLUGS 23 YEARS OLD? GEE./
IT NEEDS A TUNE UP.
SPARKS, WIRE SETS , FILTERS.
IT HAS a DISTRIBUTOR 1999 V8 , try a new cap ,rotor and HV wire set> ?????
as seen here

https://www.rockauto.com/en/catalog/gmc,1999,sierra+1500,5.3l+v8,1355475,ignition,distributor+cap,7120

Posted on Nov 24, 2022

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