misfires

2007 CHEVROLET AVALANCHE
120,000 MILES • 5.3L • V8 • 4WD
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ANTIONE HARMON
  • MEMBER
  • 2 POSTS
#7 misfires I changed the coil pack. What is next?
May 29, 2016 at 8:22 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
cheapest way is to have a professional scan for codes and freeze frame it so he can check voltages to sensors. then do basic stuff otherwise you spend a fortune in parts playing guessing game. also check for low fuel pressure and vacuum leaks auto parts rent gauge for fuel.

https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
May 29, 2016 at 8:25 AM
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