Tahoe misfiring/running rough no codes

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Aaron1201

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Oct 9, 2023
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Hey all,

2017 tahoe premier with 90k on it. Has been running like a dream until about a month ago. I started noticing the idle was a little rough, not to the point of stalling but you could feel it. Then i started noticing when driving it was almost like it was misfiring under load/heavy acceleration. Pluged my code reader up to it and found a knock sensor performance code, did a little more research and replaced the sensor, thinking that would fix it. No change, and no other codes.

Friend that works at a dealer plugged his computer up to it and told me they didnt see anything out of the ordinary with it, and just told me it was probably something related to the fuel system and recommended a injecter cleaning service for $300+ .

Just wanted to gauge some ideas on diagnosis before anything else.
 

Brewder

Member
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Apr 21, 2022
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Original spark plugs? If so, I think replacing them might be a good first step.
 

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