Sputter misfire

2006 CHEVROLET AVALANCHE
190,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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CHRIS1974AAAA
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About a month ago started a sputter between 60-65 no other problems or anything figured it was bad gas.
Today put fuel cleaner in and stutter from 40-65 for seventy miles home, only when you push lightly on gas pedal, not when you push hard,not at lower speeds, no rpm above 2000.
No noise or anything from transmission.
Suggestions?
Jul 7, 2017 at 5:45 PM
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STEVE W.
  • ✓ASE Certified Mechanic
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  • ASE Certified Mechanic
Check engine light on? I would start by cleaning the throttle body and verifying that the TPS is Okay. GM has an issue with the throttle body getting dirty and causing issues. I would also check the MAF sensor as dirt on it can cause issues.
Jul 7, 2017 at 9:57 PM
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CHRIS1974AAAA
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Can you clean the TPS/throttle body or just replace? Clean would be the first choice but how will you know if it needs replaced?
Jul 8, 2017 at 5:24 AM
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CHRIS1974AAAA
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Codes come up 02 sensor, steering sensor, and gas cap.
Jul 8, 2017 at 7:20 AM
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STEVE W.
  • ✓ASE Certified Mechanic
  • 15,200 POSTS
  • ASE Certified Mechanic
What are the exact codes?
Yes you can clean the throttle body, just use a throttle body spray to clean the crud.
https://www.2carpros.com/articles/throttle-actuator-service
https://www.2carpros.com/articles/mass-air-flow-service

You do not have to remove the throttle body to clean it.
Jul 8, 2017 at 8:03 AM
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